diff --git a/lib/Analysis/InductionVariable.cpp b/lib/Analysis/InductionVariable.cpp
index 6aaf8c018e1..c71033e4607 100644
--- a/lib/Analysis/InductionVariable.cpp
+++ b/lib/Analysis/InductionVariable.cpp
@@ -180,7 +180,7 @@ Value* InductionVariable::getExecutionCount(LoopInfo *LoopInfo) {
   }
 
   // Find final node: predecesor of the loop header that's also an exit
-  BasicBlock *terminator;
+  BasicBlock *terminator = 0;
   BasicBlock *header = L->getHeader();
   for (pred_iterator PI = pred_begin(header), PE = pred_end(header);
        PI != PE; ++PI) {
diff --git a/lib/CodeGen/InstrSelection/InstrSelection.cpp b/lib/CodeGen/InstrSelection/InstrSelection.cpp
index a2e9bb642e4..c7bf70c806b 100644
--- a/lib/CodeGen/InstrSelection/InstrSelection.cpp
+++ b/lib/CodeGen/InstrSelection/InstrSelection.cpp
@@ -220,7 +220,7 @@ InstructionSelection::InsertCodeForPhis(Function &F)
 
 void
 InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
-                                                const vector<MachineInstr*>& CpVec)
+                                            const vector<MachineInstr*>& CpVec)
 { 
   Instruction *TermInst = (Instruction*)BB->getTerminator();
   MachineCodeForInstruction &MC4Term = MachineCodeForInstruction::get(TermInst);
@@ -228,10 +228,10 @@ InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
   assert (FirstMIOfTerm && "No Machine Instrs for terminator");
 
   MachineFunction &MF = MachineFunction::get(BB->getParent());
-  MachineBasicBlock *MBB;
 
   // FIXME: if PHI instructions existed in the machine code, this would be
   // unnecesary.
+  MachineBasicBlock *MBB = 0;
   for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
     if (I->getBasicBlock() == BB) {
       MBB = I;
diff --git a/lib/Target/SparcV9/InstrSelection/InstrSelection.cpp b/lib/Target/SparcV9/InstrSelection/InstrSelection.cpp
index a2e9bb642e4..c7bf70c806b 100644
--- a/lib/Target/SparcV9/InstrSelection/InstrSelection.cpp
+++ b/lib/Target/SparcV9/InstrSelection/InstrSelection.cpp
@@ -220,7 +220,7 @@ InstructionSelection::InsertCodeForPhis(Function &F)
 
 void
 InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
-                                                const vector<MachineInstr*>& CpVec)
+                                            const vector<MachineInstr*>& CpVec)
 { 
   Instruction *TermInst = (Instruction*)BB->getTerminator();
   MachineCodeForInstruction &MC4Term = MachineCodeForInstruction::get(TermInst);
@@ -228,10 +228,10 @@ InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
   assert (FirstMIOfTerm && "No Machine Instrs for terminator");
 
   MachineFunction &MF = MachineFunction::get(BB->getParent());
-  MachineBasicBlock *MBB;
 
   // FIXME: if PHI instructions existed in the machine code, this would be
   // unnecesary.
+  MachineBasicBlock *MBB = 0;
   for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
     if (I->getBasicBlock() == BB) {
       MBB = I;
diff --git a/lib/Transforms/Instrumentation/ProfilePaths/ProfilePaths.cpp b/lib/Transforms/Instrumentation/ProfilePaths/ProfilePaths.cpp
index b0c15f7bf6b..bc815c6e23f 100644
--- a/lib/Transforms/Instrumentation/ProfilePaths/ProfilePaths.cpp
+++ b/lib/Transforms/Instrumentation/ProfilePaths/ProfilePaths.cpp
@@ -87,7 +87,7 @@ bool ProfilePaths::runOnFunction(Function &F){
   std::vector<Edge> edges;
 
   Node *tmp;
-  Node *exitNode, *startNode;
+  Node *exitNode = 0, *startNode = 0;
 
   // The nodes must be uniquesly identified:
   // That is, no two nodes must hav same BB*
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index e540310f6b3..f57d8b1c36b 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -724,13 +724,15 @@ Instruction *InstCombiner::visitAllocationInst(AllocationInst &AI) {
   if (AI.isArrayAllocation())    // Check C != 1
     if (const ConstantUInt *C = dyn_cast<ConstantUInt>(AI.getArraySize())) {
       const Type *NewTy = ArrayType::get(AI.getAllocatedType(), C->getValue());
-      AllocationInst *New;
+      AllocationInst *New = 0;
 
       // Create and insert the replacement instruction...
       if (isa<MallocInst>(AI))
         New = new MallocInst(NewTy, 0, AI.getName(), &AI);
-      else if (isa<AllocaInst>(AI))
+      else {
+        assert(isa<AllocaInst>(AI) && "Unknown type of allocation inst!");
         New = new AllocaInst(NewTy, 0, AI.getName(), &AI);
+      }
       
       // Scan to the end of the allocation instructions, to skip over a block of
       // allocas if possible...