diff --git a/llvm/include/llvm/Transforms/Scalar/GVN.h b/llvm/include/llvm/Transforms/Scalar/GVN.h
--- a/llvm/include/llvm/Transforms/Scalar/GVN.h
+++ b/llvm/include/llvm/Transforms/Scalar/GVN.h
@@ -329,6 +329,11 @@
                                AvailValInBlkVect &ValuesPerBlock,
                                UnavailBlkVect &UnavailableBlocks);
 
+  /// Given a critical edge from Pred to LoadBB, find a load instruction
+  /// which is identical to Load from another successor of Pred.
+  LoadInst *findLoadToHoistIntoPred(BasicBlock *Pred, BasicBlock *LoadBB,
+                                    LoadInst *Load);
+
   bool PerformLoadPRE(LoadInst *Load, AvailValInBlkVect &ValuesPerBlock,
                       UnavailBlkVect &UnavailableBlocks);
 
@@ -342,7 +347,8 @@
   /// AvailableLoads (connected by Phis if needed).
   void eliminatePartiallyRedundantLoad(
       LoadInst *Load, AvailValInBlkVect &ValuesPerBlock,
-      MapVector<BasicBlock *, Value *> &AvailableLoads);
+      MapVector<BasicBlock *, Value *> &AvailableLoads,
+      MapVector<BasicBlock *, LoadInst *> *CriticalEdgePredAndLoad);
 
   // Other helper routines
   bool processInstruction(Instruction *I);
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -94,6 +94,8 @@
 STATISTIC(NumGVNEqProp, "Number of equalities propagated");
 STATISTIC(NumPRELoad, "Number of loads PRE'd");
 STATISTIC(NumPRELoopLoad, "Number of loop loads PRE'd");
+STATISTIC(NumPRELoadMoved2CEPred,
+          "Number of loads moved to predecessor of a critical edge in PRE");
 
 STATISTIC(IsValueFullyAvailableInBlockNumSpeculationsMax,
           "Number of blocks speculated as available in "
@@ -127,6 +129,11 @@
     cl::desc("Max number of visited instructions when trying to find "
              "dominating value of select dependency (default = 100)"));
 
+static cl::opt<uint32_t> MaxNumInsnsPerBlock(
+    "gvn-max-num-insns", cl::Hidden, cl::init(100),
+    cl::desc("Max number of instructions to scan in each basic block in GVN "
+             "(default = 100)"));
+
 struct llvm::GVNPass::Expression {
   uint32_t opcode;
   bool commutative = false;
@@ -930,6 +937,21 @@
   return !UnavailableBB;
 }
 
+/// If the specified (BB, OldValue) exists in ValuesPerBlock, replace its value
+/// with NewValue, otherwise we don't change it.
+static void replaceValuesPerBlockEntry(
+    SmallVectorImpl<AvailableValueInBlock> &ValuesPerBlock, BasicBlock *BB,
+    Value *OldValue, Value *NewValue) {
+  for (AvailableValueInBlock &V : ValuesPerBlock) {
+    if (V.BB == BB) {
+      if ((V.AV.isSimpleValue() && V.AV.getSimpleValue() == OldValue) ||
+         (V.AV.isCoercedLoadValue() && V.AV.getCoercedLoadValue() == OldValue))
+        V = AvailableValueInBlock::get(BB, NewValue);
+      return;
+    }
+  }
+}
+
 /// Given a set of loads specified by ValuesPerBlock,
 /// construct SSA form, allowing us to eliminate Load.  This returns the value
 /// that should be used at Load's definition site.
@@ -1314,9 +1336,63 @@
          "post condition violation");
 }
 
+/// Given the following code, v1 is partially available on some edges, but not
+/// available on the edge from PredBB. This function tries to find if there is
+/// another identical load in the other successor of PredBB.
+///
+///      v0 = load %addr
+///      br %LoadBB
+///
+///   LoadBB:
+///      v1 = load %addr
+///      ...
+///
+///   PredBB:
+///      ...
+///      br %cond, label %LoadBB, label %SuccBB
+///
+///   SuccBB:
+///      v2 = load %addr
+///      ...
+///
+LoadInst *GVNPass::findLoadToHoistIntoPred(BasicBlock *Pred, BasicBlock *LoadBB,
+                                           LoadInst *Load) {
+  // For simplicity we handle a Pred has 2 successors only.
+  auto *Term = Pred->getTerminator();
+  if (Term->getNumSuccessors() != 2 || Term->isExceptionalTerminator())
+    return nullptr;
+  auto *SuccBB = Term->getSuccessor(0);
+  if (SuccBB == LoadBB)
+    SuccBB = Term->getSuccessor(1);
+  if (!SuccBB->getSinglePredecessor())
+    return nullptr;
+
+  unsigned int NumInsts = MaxNumInsnsPerBlock;
+  for (Instruction &Inst : *SuccBB) {
+    if (--NumInsts == 0)
+      return nullptr;
+
+    if (!Inst.isIdenticalTo(Load))
+      continue;
+
+    MemDepResult Dep = MD->getDependency(&Inst);
+    // If an identical load doesn't depends on any local instructions, it can
+    // be safely moved to PredBB.
+    if (Dep.isNonLocal())
+      return cast<LoadInst>(&Inst);
+
+    // Otherwise there is something in the same BB clobbers the memory, we can't
+    // move this and later load to PredBB.
+    return nullptr;
+  }
+
+  return nullptr;
+}
+
 void GVNPass::eliminatePartiallyRedundantLoad(
     LoadInst *Load, AvailValInBlkVect &ValuesPerBlock,
-    MapVector<BasicBlock *, Value *> &AvailableLoads) {
+    MapVector<BasicBlock *, Value *> &AvailableLoads,
+    MapVector<BasicBlock *, LoadInst *> *CriticalEdgePredAndLoad) {
   for (const auto &AvailableLoad : AvailableLoads) {
     BasicBlock *UnavailableBlock = AvailableLoad.first;
     Value *LoadPtr = AvailableLoad.second;
@@ -1370,6 +1446,24 @@
         AvailableValueInBlock::get(UnavailableBlock, NewLoad));
     MD->invalidateCachedPointerInfo(LoadPtr);
     LLVM_DEBUG(dbgs() << "GVN INSERTED " << *NewLoad << '\n');
+
+    // For PredBB in CriticalEdgePredAndLoad we need to replace the uses of old
+    // load instruction with the new created load instruction.
+    if (CriticalEdgePredAndLoad) {
+      auto I = CriticalEdgePredAndLoad->find(UnavailableBlock);
+      if (I != CriticalEdgePredAndLoad->end()) {
+        ++NumPRELoadMoved2CEPred;
+        ICF->insertInstructionTo(NewLoad, UnavailableBlock);
+        LoadInst *OldLoad = I->second;
+        OldLoad->replaceAllUsesWith(NewLoad);
+        replaceValuesPerBlockEntry(ValuesPerBlock, OldLoad->getParent(),
+                                   OldLoad, NewLoad);
+        if (uint32_t ValNo = VN.lookup(OldLoad, false))
+          removeFromLeaderTable(ValNo, OldLoad, OldLoad->getParent());
+        // To avoid deleting an instruction from different BB, we just leave
+        // the dead load here, it will be deleted in next iteration.
+      }
+    }
   }
 
   // Perform PHI construction.
@@ -1456,7 +1550,12 @@
   for (BasicBlock *UnavailableBB : UnavailableBlocks)
     FullyAvailableBlocks[UnavailableBB] = AvailabilityState::Unavailable;
 
-  SmallVector<BasicBlock *, 4> CriticalEdgePred;
+  // The edge from Pred to LoadBB is a critical edge will be splitted.
+  SmallVector<BasicBlock *, 4> CriticalEdgePredSplit;
+  // The edge from Pred to LoadBB is a critical edge, another successor of Pred
+  // contains a load can be moved to Pred. This data structure maps the Pred to
+  // the movable load.
+  MapVector<BasicBlock *, LoadInst *> CriticalEdgePredAndLoad;
   for (BasicBlock *Pred : predecessors(LoadBB)) {
     // If any predecessor block is an EH pad that does not allow non-PHI
     // instructions before the terminator, we can't PRE the load.
@@ -1496,7 +1595,10 @@
           return false;
         }
 
-      CriticalEdgePred.push_back(Pred);
+      if (LoadInst *LI = findLoadToHoistIntoPred(Pred, LoadBB, Load))
+        CriticalEdgePredAndLoad[Pred] = LI;
+      else
+        CriticalEdgePredSplit.push_back(Pred);
     } else {
       // Only add the predecessors that will not be split for now.
       PredLoads[Pred] = nullptr;
@@ -1504,31 +1606,37 @@
   }
 
   // Decide whether PRE is profitable for this load.
-  unsigned NumUnavailablePreds = PredLoads.size() + CriticalEdgePred.size();
+  unsigned NumInsertPreds = PredLoads.size() + CriticalEdgePredSplit.size();
+  unsigned NumUnavailablePreds = NumInsertPreds +
+      CriticalEdgePredAndLoad.size();
   assert(NumUnavailablePreds != 0 &&
          "Fully available value should already be eliminated!");
 
-  // If this load is unavailable in multiple predecessors, reject it.
+  // If we need to insert new load in multiple predecessors, reject it.
   // FIXME: If we could restructure the CFG, we could make a common pred with
   // all the preds that don't have an available Load and insert a new load into
   // that one block.
-  if (NumUnavailablePreds != 1)
+  if (NumInsertPreds > 1)
       return false;
 
   // Now we know where we will insert load. We must ensure that it is safe
   // to speculatively execute the load at that points.
   if (MustEnsureSafetyOfSpeculativeExecution) {
-    if (CriticalEdgePred.size())
+    if (CriticalEdgePredSplit.size())
       if (!isSafeToSpeculativelyExecute(Load, LoadBB->getFirstNonPHI(), AC, DT))
         return false;
     for (auto &PL : PredLoads)
       if (!isSafeToSpeculativelyExecute(Load, PL.first->getTerminator(), AC,
                                         DT))
         return false;
+    for (auto &CEP : CriticalEdgePredAndLoad)
+      if (!isSafeToSpeculativelyExecute(Load, CEP.first->getTerminator(), AC,
+                                        DT))
+        return false;
   }
 
   // Split critical edges, and update the unavailable predecessors accordingly.
-  for (BasicBlock *OrigPred : CriticalEdgePred) {
+  for (BasicBlock *OrigPred : CriticalEdgePredSplit) {
     BasicBlock *NewPred = splitCriticalEdges(OrigPred, LoadBB);
     assert(!PredLoads.count(OrigPred) && "Split edges shouldn't be in map!");
     PredLoads[NewPred] = nullptr;
@@ -1536,6 +1644,9 @@
                       << LoadBB->getName() << '\n');
   }
 
+  for (auto &CEP : CriticalEdgePredAndLoad)
+    PredLoads[CEP.first] = nullptr;
+
   // Check if the load can safely be moved to all the unavailable predecessors.
   bool CanDoPRE = true;
   const DataLayout &DL = Load->getModule()->getDataLayout();
@@ -1592,7 +1703,7 @@
     }
     // HINT: Don't revert the edge-splitting as following transformation may
     // also need to split these critical edges.
-    return !CriticalEdgePred.empty();
+    return !CriticalEdgePredSplit.empty();
   }
 
   // Okay, we can eliminate this load by inserting a reload in the predecessor
@@ -1617,7 +1728,8 @@
     VN.lookupOrAdd(I);
   }
 
-  eliminatePartiallyRedundantLoad(Load, ValuesPerBlock, PredLoads);
+  eliminatePartiallyRedundantLoad(Load, ValuesPerBlock, PredLoads,
+                                  &CriticalEdgePredAndLoad);
   ++NumPRELoad;
   return true;
 }
@@ -1696,7 +1808,8 @@
   AvailableLoads[Preheader] = LoadPtr;
 
   LLVM_DEBUG(dbgs() << "GVN REMOVING PRE LOOP LOAD: " << *Load << '\n');
-  eliminatePartiallyRedundantLoad(Load, ValuesPerBlock, AvailableLoads);
+  eliminatePartiallyRedundantLoad(Load, ValuesPerBlock, AvailableLoads,
+                                  /*CriticalEdgePredAndLoad*/ nullptr);
   ++NumPRELoopLoad;
   return true;
 }
diff --git a/llvm/test/Transforms/GVN/PRE/2011-06-01-NonLocalMemdepMiscompile.ll b/llvm/test/Transforms/GVN/PRE/2011-06-01-NonLocalMemdepMiscompile.ll
--- a/llvm/test/Transforms/GVN/PRE/2011-06-01-NonLocalMemdepMiscompile.ll
+++ b/llvm/test/Transforms/GVN/PRE/2011-06-01-NonLocalMemdepMiscompile.ll
@@ -57,7 +57,7 @@
 ; CHECK-NEXT:    br label %bb15
 
 ; CHECK-LABEL: bb15:
-; CHECK:         %tmp17 = phi i8 [ %tmp8, %bb15split ], [ %tmp17.pre, %bb1.bb15_crit_edge ]
+; CHECK:         %tmp17 = phi i8 [ %tmp12.pre3, %bb15split ], [ %tmp17.pre, %bb1.bb15_crit_edge ]
 
 bb19:                                             ; preds = %bb15
   ret i1 %tmp18
diff --git a/llvm/test/Transforms/GVN/PRE/2017-06-28-pre-load-dbgloc.ll b/llvm/test/Transforms/GVN/PRE/2017-06-28-pre-load-dbgloc.ll
--- a/llvm/test/Transforms/GVN/PRE/2017-06-28-pre-load-dbgloc.ll
+++ b/llvm/test/Transforms/GVN/PRE/2017-06-28-pre-load-dbgloc.ll
@@ -1,6 +1,6 @@
 ; This test checks if debug loc is propagated to load/store created by GVN/Instcombine.
-; RUN: opt < %s -passes=gvn -S | FileCheck %s --check-prefixes=ALL,GVN
-; RUN: opt < %s -passes=gvn,instcombine -S | FileCheck %s --check-prefixes=ALL,INSTCOMBINE
+; RUN: opt < %s -passes=gvn -S | FileCheck %s --check-prefixes=ALL
+; RUN: opt < %s -passes=gvn,instcombine -S | FileCheck %s --check-prefixes=ALL
 
 ; struct node {
 ;  int  *v;
@@ -35,10 +35,9 @@
 entry:
   %tobool = icmp eq ptr %desc, null
   br i1 %tobool, label %cond.end, label %cond.false, !dbg !9
-; ALL: br i1 %tobool, label %entry.cond.end_crit_edge, label %cond.false, !dbg [[LOC_15_6:![0-9]+]]
-; ALL: entry.cond.end_crit_edge:
-; GVN: %.pre = load ptr, ptr null, align 8, !dbg [[LOC_16_13:![0-9]+]]
-; INSTCOMBINE:store ptr poison, ptr null, align 4294967296, !dbg [[LOC_16_13:![0-9]+]]
+; ALL: %.pre = load ptr, ptr %desc, align 8, !dbg [[LOC_16_13:![0-9]+]]
+; ALL: br i1 %tobool, label %cond.end, label %cond.false, !dbg [[LOC_15_6:![0-9]+]]
+; ALL: cond.false:
 
 cond.false:
   %0 = load ptr, ptr %desc, align 8, !dbg !11
@@ -72,5 +71,5 @@
 !11 = !DILocation(line: 15, column: 34, scope: !4)
 
 ;ALL: [[SCOPE:![0-9]+]] = distinct  !DISubprogram(name: "test",{{.*}}
-;ALL: [[LOC_15_6]] = !DILocation(line: 15, column: 6, scope: [[SCOPE]])
 ;ALL: [[LOC_16_13]] = !DILocation(line: 16, column: 13, scope: [[SCOPE]])
+;ALL: [[LOC_15_6]] = !DILocation(line: 15, column: 6, scope: [[SCOPE]])
diff --git a/llvm/test/Transforms/GVN/PRE/2018-06-08-pre-load-dbgloc-no-null-opt.ll b/llvm/test/Transforms/GVN/PRE/2018-06-08-pre-load-dbgloc-no-null-opt.ll
--- a/llvm/test/Transforms/GVN/PRE/2018-06-08-pre-load-dbgloc-no-null-opt.ll
+++ b/llvm/test/Transforms/GVN/PRE/2018-06-08-pre-load-dbgloc-no-null-opt.ll
@@ -35,9 +35,9 @@
 entry:
   %tobool = icmp eq ptr %desc, null
   br i1 %tobool, label %cond.end, label %cond.false, !dbg !9
-; ALL: br i1 %tobool, label %entry.cond.end_crit_edge, label %cond.false, !dbg [[LOC_15_6:![0-9]+]]
-; ALL: entry.cond.end_crit_edge:
-; ALL: load ptr, ptr null, align {{[0-9]+}}, !dbg [[LOC_16_13:![0-9]+]]
+; ALL: %.pre = load ptr, ptr %desc, align 8, !dbg [[LOC_16_13:![0-9]+]]
+; ALL: br i1 %tobool, label %cond.end, label %cond.false, !dbg [[LOC_15_6:![0-9]+]]
+; ALL: cond.false:
 
 cond.false:
   %0 = load ptr, ptr %desc, align 8, !dbg !11
@@ -45,8 +45,7 @@
   br label %cond.end, !dbg !9
 
 cond.end:
-; ALL: phi ptr [ %0, %cond.false ], [ %.pre, %entry.cond.end_crit_edge ]
-; ALL: phi ptr [ %1, %cond.false ], [ null, %entry.cond.end_crit_edge ]
+; ALL: phi ptr [ %0, %cond.false ], [ null, %entry ]
 
   %2 = phi ptr [ %1, %cond.false ], [ null, %entry ], !dbg !9
   %3 = load ptr, ptr %desc, align 8, !dbg !10
@@ -75,5 +74,5 @@
 !11 = !DILocation(line: 15, column: 34, scope: !4)
 
 ;ALL: [[SCOPE:![0-9]+]] = distinct  !DISubprogram(name: "test_no_null_opt",{{.*}}
-;ALL: [[LOC_15_6]] = !DILocation(line: 15, column: 6, scope: [[SCOPE]])
 ;ALL: [[LOC_16_13]] = !DILocation(line: 16, column: 13, scope: [[SCOPE]])
+;ALL: [[LOC_15_6]] = !DILocation(line: 15, column: 6, scope: [[SCOPE]])
diff --git a/llvm/test/Transforms/GVN/PRE/pre-load.ll b/llvm/test/Transforms/GVN/PRE/pre-load.ll
--- a/llvm/test/Transforms/GVN/PRE/pre-load.ll
+++ b/llvm/test/Transforms/GVN/PRE/pre-load.ll
@@ -687,18 +687,14 @@
 ; CHECK-LABEL: @test15(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[A:%.*]], 0
-; CHECK-NEXT:    br i1 [[TOBOOL]], label [[ENTRY_IF_END_CRIT_EDGE:%.*]], label [[IF_THEN:%.*]]
-; CHECK:       entry.if.end_crit_edge:
 ; CHECK-NEXT:    [[VV_PRE:%.*]] = load i32, ptr [[X:%.*]], align 4
-; CHECK-NEXT:    br label [[IF_END:%.*]]
+; CHECK-NEXT:    br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
 ; CHECK:       if.then:
-; CHECK-NEXT:    [[UU:%.*]] = load i32, ptr [[X]], align 4
-; CHECK-NEXT:    store i32 [[UU]], ptr [[R:%.*]], align 4
+; CHECK-NEXT:    store i32 [[VV_PRE]], ptr [[R:%.*]], align 4
 ; CHECK-NEXT:    br label [[IF_END]]
 ; CHECK:       if.end:
-; CHECK-NEXT:    [[VV:%.*]] = phi i32 [ [[VV_PRE]], [[ENTRY_IF_END_CRIT_EDGE]] ], [ [[UU]], [[IF_THEN]] ]
 ; CHECK-NEXT:    call void @f()
-; CHECK-NEXT:    ret i32 [[VV]]
+; CHECK-NEXT:    ret i32 [[VV_PRE]]
 ;
 
 entry:
@@ -728,18 +724,14 @@
 ; CHECK-LABEL: @test16(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[A:%.*]], 0
-; CHECK-NEXT:    br i1 [[TOBOOL]], label [[ENTRY_IF_END_CRIT_EDGE:%.*]], label [[IF_THEN:%.*]]
-; CHECK:       entry.if.end_crit_edge:
 ; CHECK-NEXT:    [[VV_PRE:%.*]] = load i32, ptr [[X:%.*]], align 4
-; CHECK-NEXT:    br label [[IF_END:%.*]]
+; CHECK-NEXT:    br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
 ; CHECK:       if.then:
-; CHECK-NEXT:    [[UU:%.*]] = load i32, ptr [[X]], align 4
-; CHECK-NEXT:    store i32 [[UU]], ptr [[R:%.*]], align 4
+; CHECK-NEXT:    store i32 [[VV_PRE]], ptr [[R:%.*]], align 4
 ; CHECK-NEXT:    br label [[IF_END]]
 ; CHECK:       if.end:
-; CHECK-NEXT:    [[VV:%.*]] = phi i32 [ [[VV_PRE]], [[ENTRY_IF_END_CRIT_EDGE]] ], [ [[UU]], [[IF_THEN]] ]
 ; CHECK-NEXT:    call void @f()
-; CHECK-NEXT:    ret i32 [[VV]]
+; CHECK-NEXT:    ret i32 [[VV_PRE]]
 ;
 
 entry:
@@ -787,22 +779,22 @@
 ; CHECK-NEXT:    store i64 [[V2]], ptr [[P1]], align 8
 ; CHECK-NEXT:    br label [[BB3:%.*]]
 ; CHECK:       bb3:
-; CHECK-NEXT:    [[V3:%.*]] = load i64, ptr [[P1]], align 8
+; CHECK-NEXT:    [[V3:%.*]] = phi i64 [ [[V3_PRE:%.*]], [[BB200]] ], [ [[V3_PRE1:%.*]], [[BB100]] ], [ [[V2]], [[BB2]] ]
 ; CHECK-NEXT:    store i64 [[V3]], ptr [[P2:%.*]], align 8
 ; CHECK-NEXT:    ret void
 ; CHECK:       bb100:
 ; CHECK-NEXT:    [[COND3:%.*]] = call i1 @foo()
+; CHECK-NEXT:    [[V3_PRE1]] = load i64, ptr [[P1]], align 8
 ; CHECK-NEXT:    br i1 [[COND3]], label [[BB3]], label [[BB101:%.*]]
 ; CHECK:       bb101:
-; CHECK-NEXT:    [[V4:%.*]] = load i64, ptr [[P1]], align 8
-; CHECK-NEXT:    store i64 [[V4]], ptr [[P3:%.*]], align 8
+; CHECK-NEXT:    store i64 [[V3_PRE1]], ptr [[P3:%.*]], align 8
 ; CHECK-NEXT:    ret void
 ; CHECK:       bb200:
 ; CHECK-NEXT:    [[COND4:%.*]] = call i1 @bar()
+; CHECK-NEXT:    [[V3_PRE]] = load i64, ptr [[P1]], align 8
 ; CHECK-NEXT:    br i1 [[COND4]], label [[BB3]], label [[BB201:%.*]]
 ; CHECK:       bb201:
-; CHECK-NEXT:    [[V5:%.*]] = load i64, ptr [[P1]], align 8
-; CHECK-NEXT:    store i64 [[V5]], ptr [[P4:%.*]], align 8
+; CHECK-NEXT:    store i64 [[V3_PRE]], ptr [[P4:%.*]], align 8
 ; CHECK-NEXT:    ret void
 ;
 {
@@ -843,3 +835,172 @@
   store i64 %v5, ptr %p4, align 8
   ret void
 }
+
+; The output value from %if.then block is %dec, not loaded %v1.
+; So ValuesPerBlock[%if.then] should not be replaced when the load instruction
+; is moved to %entry.
+define void @test18(i1 %cond, ptr %p1, ptr %p2) {
+; CHECK-LABEL: @test18(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[V2_PRE:%.*]] = load i16, ptr [[P1:%.*]], align 2
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[DEC:%.*]] = add i16 [[V2_PRE]], -1
+; CHECK-NEXT:    store i16 [[DEC]], ptr [[P1]], align 2
+; CHECK-NEXT:    br label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[V2:%.*]] = phi i16 [ [[DEC]], [[IF_THEN]] ], [ [[V2_PRE]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    store i16 [[V2]], ptr [[P2:%.*]], align 2
+; CHECK-NEXT:    ret void
+;
+entry:
+  br i1 %cond, label %if.end, label %if.then
+
+if.then:
+  %v1 = load i16, ptr %p1
+  %dec = add i16 %v1, -1
+  store i16 %dec, ptr %p1
+  br label %if.end
+
+if.end:
+  %v2 = load i16, ptr %p1
+  store i16 %v2, ptr %p2
+  ret void
+}
+
+; PRE of load instructions should not cross exception handling instructions.
+define void @test19(i1 %cond, ptr %p1, ptr %p2)
+; CHECK-LABEL: @test19(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
+; CHECK:       then:
+; CHECK-NEXT:    [[V2:%.*]] = load i64, ptr [[P2:%.*]], align 8
+; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[V2]], 1
+; CHECK-NEXT:    store i64 [[ADD]], ptr [[P1:%.*]], align 8
+; CHECK-NEXT:    br label [[END:%.*]]
+; CHECK:       else:
+; CHECK-NEXT:    invoke void @f()
+; CHECK-NEXT:    to label [[ELSE_END_CRIT_EDGE:%.*]] unwind label [[LPAD:%.*]]
+; CHECK:       else.end_crit_edge:
+; CHECK-NEXT:    [[V1_PRE:%.*]] = load i64, ptr [[P1]], align 8
+; CHECK-NEXT:    br label [[END]]
+; CHECK:       end:
+; CHECK-NEXT:    [[V1:%.*]] = phi i64 [ [[V1_PRE]], [[ELSE_END_CRIT_EDGE]] ], [ [[ADD]], [[THEN]] ]
+; CHECK-NEXT:    [[AND:%.*]] = and i64 [[V1]], 100
+; CHECK-NEXT:    store i64 [[AND]], ptr [[P2]], align 8
+; CHECK-NEXT:    ret void
+; CHECK:       lpad:
+; CHECK-NEXT:    [[LP:%.*]] = landingpad { ptr, i32 }
+; CHECK-NEXT:    cleanup
+; CHECK-NEXT:    [[V3:%.*]] = load i64, ptr [[P1]], align 8
+; CHECK-NEXT:    [[OR:%.*]] = or i64 [[V3]], 200
+; CHECK-NEXT:    store i64 [[OR]], ptr [[P1]], align 8
+; CHECK-NEXT:    resume { ptr, i32 } [[LP]]
+;
+  personality ptr @__CxxFrameHandler3 {
+entry:
+  br i1 %cond, label %then, label %else
+
+then:
+  %v2 = load i64, ptr %p2
+  %add = add i64 %v2, 1
+  store i64 %add, ptr %p1
+  br label %end
+
+else:
+  invoke void @f()
+  to label %end unwind label %lpad
+
+end:
+  %v1 = load i64, ptr %p1
+  %and = and i64 %v1, 100
+  store i64 %and, ptr %p2
+  ret void
+
+lpad:
+  %lp = landingpad { ptr, i32 }
+  cleanup
+  %v3 = load i64, ptr %p1
+  %or = or i64 %v3, 200
+  store i64 %or, ptr %p1
+  resume { ptr, i32 } %lp
+}
+
+; A predecessor BB has both successors to the same BB, for simplicity we don't
+; handle it, nothing should be changed.
+define void @test20(i1 %cond, i1 %cond2, ptr %p1, ptr %p2) {
+; CHECK-LABEL: @test20(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[V1:%.*]] = load i16, ptr [[P1:%.*]], align 2
+; CHECK-NEXT:    [[DEC:%.*]] = add i16 [[V1]], -1
+; CHECK-NEXT:    store i16 [[DEC]], ptr [[P1]], align 2
+; CHECK-NEXT:    br label [[IF_END:%.*]]
+; CHECK:       if.else:
+; CHECK-NEXT:    br i1 [[COND2:%.*]], label [[IF_END]], label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[V2:%.*]] = load i16, ptr [[P1]], align 2
+; CHECK-NEXT:    store i16 [[V2]], ptr [[P2:%.*]], align 2
+; CHECK-NEXT:    ret void
+;
+entry:
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %v1 = load i16, ptr %p1
+  %dec = add i16 %v1, -1
+  store i16 %dec, ptr %p1
+  br label %if.end
+
+if.else:
+  br i1 %cond2, label %if.end, label %if.end
+
+if.end:
+  %v2 = load i16, ptr %p1
+  store i16 %v2, ptr %p2
+  ret void
+}
+
+; More edges from the same BB to LoadBB. Don't change anything.
+define void @test21(i1 %cond, i32 %code, ptr %p1, ptr %p2) {
+; CHECK-LABEL: @test21(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[V1:%.*]] = load i16, ptr [[P1:%.*]], align 2
+; CHECK-NEXT:    [[DEC:%.*]] = add i16 [[V1]], -1
+; CHECK-NEXT:    store i16 [[DEC]], ptr [[P1]], align 2
+; CHECK-NEXT:    br label [[IF_END:%.*]]
+; CHECK:       if.else:
+; CHECK-NEXT:    switch i32 [[CODE:%.*]], label [[IF_END]] [
+; CHECK-NEXT:    i32 1, label [[IF_END]]
+; CHECK-NEXT:    i32 2, label [[IF_END]]
+; CHECK-NEXT:    i32 3, label [[IF_END]]
+; CHECK-NEXT:    ]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[V2:%.*]] = load i16, ptr [[P1]], align 2
+; CHECK-NEXT:    store i16 [[V2]], ptr [[P2:%.*]], align 2
+; CHECK-NEXT:    ret void
+;
+entry:
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %v1 = load i16, ptr %p1
+  %dec = add i16 %v1, -1
+  store i16 %dec, ptr %p1
+  br label %if.end
+
+if.else:
+  switch i32 %code, label %if.end [
+  i32 1, label %if.end
+  i32 2, label %if.end
+  i32 3, label %if.end
+  ]
+
+if.end:
+  %v2 = load i16, ptr %p1
+  store i16 %v2, ptr %p2
+  ret void
+}
diff --git a/llvm/test/Transforms/GVN/PRE/volatile.ll b/llvm/test/Transforms/GVN/PRE/volatile.ll
--- a/llvm/test/Transforms/GVN/PRE/volatile.ll
+++ b/llvm/test/Transforms/GVN/PRE/volatile.ll
@@ -122,18 +122,14 @@
 define i32 @test7(i1 %c, ptr noalias nocapture %p, ptr noalias nocapture %q) {
 ; CHECK-LABEL: @test7(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    br i1 [[C:%.*]], label [[ENTRY_HEADER_CRIT_EDGE:%.*]], label [[SKIP:%.*]]
-; CHECK:       entry.header_crit_edge:
 ; CHECK-NEXT:    [[Y_PRE:%.*]] = load i32, ptr [[P:%.*]], align 4
-; CHECK-NEXT:    br label [[HEADER:%.*]]
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[HEADER:%.*]], label [[SKIP:%.*]]
 ; CHECK:       skip:
-; CHECK-NEXT:    [[Y1:%.*]] = load i32, ptr [[P]], align 4
-; CHECK-NEXT:    call void @use(i32 [[Y1]])
+; CHECK-NEXT:    call void @use(i32 [[Y_PRE]])
 ; CHECK-NEXT:    br label [[HEADER]]
 ; CHECK:       header:
-; CHECK-NEXT:    [[Y:%.*]] = phi i32 [ [[Y_PRE]], [[ENTRY_HEADER_CRIT_EDGE]] ], [ [[Y]], [[HEADER]] ], [ [[Y1]], [[SKIP]] ]
 ; CHECK-NEXT:    [[X:%.*]] = load volatile i32, ptr [[Q:%.*]], align 4
-; CHECK-NEXT:    [[ADD:%.*]] = sub i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[ADD:%.*]] = sub i32 [[Y_PRE]], [[X]]
 ; CHECK-NEXT:    [[CND:%.*]] = icmp eq i32 [[ADD]], 0
 ; CHECK-NEXT:    br i1 [[CND]], label [[EXIT:%.*]], label [[HEADER]]
 ; CHECK:       exit:
diff --git a/llvm/test/Transforms/GVN/condprop.ll b/llvm/test/Transforms/GVN/condprop.ll
--- a/llvm/test/Transforms/GVN/condprop.ll
+++ b/llvm/test/Transforms/GVN/condprop.ll
@@ -521,19 +521,15 @@
 ; CHECK-NEXT:    [[GEP1:%.*]] = getelementptr i32, ptr [[PTR2:%.*]], i32 1
 ; CHECK-NEXT:    [[GEP2:%.*]] = getelementptr i32, ptr [[PTR2]], i32 2
 ; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[PTR1:%.*]], [[PTR2]]
-; CHECK-NEXT:    br i1 [[CMP]], label [[IF:%.*]], label [[ENTRY_END_CRIT_EDGE:%.*]]
-; CHECK:       entry.end_crit_edge:
 ; CHECK-NEXT:    [[VAL2_PRE:%.*]] = load i32, ptr [[GEP2]], align 4
-; CHECK-NEXT:    br label [[END:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
 ; CHECK:       if:
-; CHECK-NEXT:    [[VAL1:%.*]] = load i32, ptr [[GEP2]], align 4
 ; CHECK-NEXT:    br label [[END]]
 ; CHECK:       end:
-; CHECK-NEXT:    [[VAL2:%.*]] = phi i32 [ [[VAL1]], [[IF]] ], [ [[VAL2_PRE]], [[ENTRY_END_CRIT_EDGE]] ]
-; CHECK-NEXT:    [[PHI1:%.*]] = phi ptr [ [[PTR2]], [[IF]] ], [ [[GEP1]], [[ENTRY_END_CRIT_EDGE]] ]
-; CHECK-NEXT:    [[PHI2:%.*]] = phi i32 [ [[VAL1]], [[IF]] ], [ 0, [[ENTRY_END_CRIT_EDGE]] ]
+; CHECK-NEXT:    [[PHI1:%.*]] = phi ptr [ [[PTR2]], [[IF]] ], [ [[GEP1]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[PHI2:%.*]] = phi i32 [ [[VAL2_PRE]], [[IF]] ], [ 0, [[ENTRY]] ]
 ; CHECK-NEXT:    store i32 0, ptr [[PHI1]], align 4
-; CHECK-NEXT:    [[RET:%.*]] = add i32 [[PHI2]], [[VAL2]]
+; CHECK-NEXT:    [[RET:%.*]] = add i32 [[PHI2]], [[VAL2_PRE]]
 ; CHECK-NEXT:    ret i32 [[RET]]
 ;
 entry: