diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 19d16587275..39bf95b92d9 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -6155,7 +6155,6 @@ ScalarEvolution::isKnownPredicateWithRanges(ICmpInst::Predicate Pred,
   default:
     llvm_unreachable("Unexpected ICmpInst::Predicate value!");
   case ICmpInst::ICMP_SGT:
-    Pred = ICmpInst::ICMP_SLT;
     std::swap(LHS, RHS);
   case ICmpInst::ICMP_SLT: {
     ConstantRange LHSRange = getSignedRange(LHS);
@@ -6167,7 +6166,6 @@ ScalarEvolution::isKnownPredicateWithRanges(ICmpInst::Predicate Pred,
     break;
   }
   case ICmpInst::ICMP_SGE:
-    Pred = ICmpInst::ICMP_SLE;
     std::swap(LHS, RHS);
   case ICmpInst::ICMP_SLE: {
     ConstantRange LHSRange = getSignedRange(LHS);
@@ -6179,7 +6177,6 @@ ScalarEvolution::isKnownPredicateWithRanges(ICmpInst::Predicate Pred,
     break;
   }
   case ICmpInst::ICMP_UGT:
-    Pred = ICmpInst::ICMP_ULT;
     std::swap(LHS, RHS);
   case ICmpInst::ICMP_ULT: {
     ConstantRange LHSRange = getUnsignedRange(LHS);
@@ -6191,7 +6188,6 @@ ScalarEvolution::isKnownPredicateWithRanges(ICmpInst::Predicate Pred,
     break;
   }
   case ICmpInst::ICMP_UGE:
-    Pred = ICmpInst::ICMP_ULE;
     std::swap(LHS, RHS);
   case ICmpInst::ICMP_ULE: {
     ConstantRange LHSRange = getUnsignedRange(LHS);
@@ -6597,7 +6593,7 @@ ScalarEvolution::HowManyLessThans(const SCEV *LHS, const SCEV *RHS,
     IsSigned ? APIntOps::smin(getSignedRange(RHS).getSignedMax(), Limit)
              : APIntOps::umin(getUnsignedRange(RHS).getUnsignedMax(), Limit);
 
-  const SCEV *MaxBECount = getCouldNotCompute();
+  const SCEV *MaxBECount;
   if (isa<SCEVConstant>(BECount))
     MaxBECount = BECount;
   else
@@ -7114,7 +7110,6 @@ public:
           Operands.push_back(Expr->getOperand(i));
       }
     } else {
-      FoundGCDTerm = false;
       const SCEV *PartialGCD = One;
       for (int i = 0, e = Expr->getNumOperands(); i < e; ++i) {
         if (PartialGCD == GCD) {
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 4f0213299aa..bbb5cd203b1 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -317,7 +317,6 @@ void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
         OS << "tied";
         if (TiedTo != 15)
           OS << unsigned(TiedTo - 1);
-        NeedComma = true;
       }
       OS << '>';
     }
@@ -1687,7 +1686,7 @@ void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM,
       }
     }
   } else if (!debugLoc.isUnknown() && MF) {
-    if (!HaveSemi) OS << ";"; HaveSemi = true;
+    if (!HaveSemi) OS << ";";
     OS << " dbg:";
     printDebugLoc(debugLoc, MF, OS);
   }
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index 727f50ff5a3..036a896791c 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -282,7 +282,6 @@ bool CoalescerPair::setRegisters(const MachineInstr *MI) {
     if (SrcSub) {
       Dst = TRI.getMatchingSuperReg(Dst, SrcSub, MRI.getRegClass(Src));
       if (!Dst) return false;
-      SrcSub = 0;
     } else if (!MRI.getRegClass(Src)->contains(Dst)) {
       return false;
     }
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index f227be19471..2c991aa8e24 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -7506,7 +7506,6 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
     CommuteVectorShuffleMask(M, NumElems);
     std::swap(V1, V2);
     std::swap(V1IsSplat, V2IsSplat);
-    Commuted = false;
 
     if (isUNPCKLMask(M, VT, HasInt256))
       return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V2, DAG);
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 17a91a1e289..272a16db8f5 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -422,7 +422,7 @@ void Formula::print(raw_ostream &OS) const {
     OS << ')';
   }
   if (UnfoldedOffset != 0) {
-    if (!First) OS << " + "; else First = false;
+    if (!First) OS << " + ";
     OS << "imm(" << UnfoldedOffset << ')';
   }
 }