From 584520e8e2c1f8cc04bc8dd4dc4ea6c390627317 Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Sun, 23 Jan 2011 17:05:06 +0000
Subject: [PATCH] Null initialize a few variables flagged by clang's
 -Wuninitialized-experimental warning. While these don't look like real bugs,
 clang's -Wuninitialized-experimental analysis is stricter than GCC's, and
 these fixes have the benefit of being general nice cleanups.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124073 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/ProfileInfo.cpp                         | 2 +-
 lib/CodeGen/SelectionDAG/SelectionDAG.cpp            | 2 +-
 lib/Support/APFloat.cpp                              | 2 +-
 lib/Target/ARM/ARMExpandPseudoInsts.cpp              | 2 +-
 lib/Target/CellSPU/SPUISelDAGToDAG.cpp               | 2 +-
 lib/Target/X86/Disassembler/X86DisassemblerDecoder.c | 2 +-
 lib/Transforms/InstCombine/InstCombineShifts.cpp     | 2 +-
 7 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/lib/Analysis/ProfileInfo.cpp b/lib/Analysis/ProfileInfo.cpp
index 51dee2d13f0..36f211e858d 100644
--- a/lib/Analysis/ProfileInfo.cpp
+++ b/lib/Analysis/ProfileInfo.cpp
@@ -889,7 +889,7 @@ void ProfileInfoT<Function,BasicBlock>::repair(const Function *F) {
     FI = Unvisited.begin(), FE = Unvisited.end();
     while(FI != FE && !FoundPath) {
       const BasicBlock *BB = *FI; ++FI;
-      const BasicBlock *Dest;
+      const BasicBlock *Dest = 0;
       Path P;
       bool BackEdgeFound = false;
       for (const_pred_iterator NBB = pred_begin(BB), End = pred_end(BB);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 89b1e9b0b5e..f6aea1f7956 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4931,7 +4931,7 @@ SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
                              const SDValue *Ops, unsigned NumOps) {
   bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Glue;
   MachineSDNode *N;
-  void *IP;
+  void *IP = 0;
 
   if (DoCSE) {
     FoldingSetNodeID ID;
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 0048ce57c2e..6d018afa3f6 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -175,7 +175,7 @@ totalExponent(StringRef::iterator p, StringRef::iterator end,
 {
   int unsignedExponent;
   bool negative, overflow;
-  int exponent;
+  int exponent = 0;
 
   assert(p != end && "Exponent has no digits");
 
diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 4191d687284..7e9d2179f77 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -518,7 +518,7 @@ void ARMExpandPseudo::ExpandLaneOp(MachineBasicBlock::iterator &MBBI) {
   }
   assert(Lane < RegElts && "out of range lane for VLD/VST-lane");
 
-  unsigned D0, D1, D2, D3;
+  unsigned D0 = 0, D1 = 0, D2 = 0, D3 = 0;
   unsigned DstReg = 0;
   bool DstIsDead = false;
   if (TableEntry->IsLoad) {
diff --git a/lib/Target/CellSPU/SPUISelDAGToDAG.cpp b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
index 7b4d8ccb5af..d2261562e72 100644
--- a/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
+++ b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
@@ -612,7 +612,7 @@ SDNode *
 SPUDAGToDAGISel::Select(SDNode *N) {
   unsigned Opc = N->getOpcode();
   int n_ops = -1;
-  unsigned NewOpc;
+  unsigned NewOpc = 0;
   EVT OpVT = N->getValueType(0);
   SDValue Ops[8];
   DebugLoc dl = N->getDebugLoc();
diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
index 0af510c4cec..7b17f1e5a3a 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
@@ -290,7 +290,7 @@ static int readPrefixes(struct InternalInstruction* insn) {
   BOOL isPrefix = TRUE;
   BOOL prefixGroups[4] = { FALSE };
   uint64_t prefixLocation;
-  uint8_t byte;
+  uint8_t byte = 0;
   
   BOOL hasAdSize = FALSE;
   BOOL hasOpSize = FALSE;
diff --git a/lib/Transforms/InstCombine/InstCombineShifts.cpp b/lib/Transforms/InstCombine/InstCombineShifts.cpp
index fe791ddaf7b..988f29e16a4 100644
--- a/lib/Transforms/InstCombine/InstCombineShifts.cpp
+++ b/lib/Transforms/InstCombine/InstCombineShifts.cpp
@@ -76,7 +76,7 @@ static bool CanEvaluateShifted(Value *V, unsigned NumBits, bool isLeftShift,
   // if the needed bits are already zero in the input.  This allows us to reuse
   // the value which means that we don't care if the shift has multiple uses.
   //  TODO:  Handle opposite shift by exact value.
-  ConstantInt *CI;
+  ConstantInt *CI = 0;
   if ((isLeftShift && match(I, m_LShr(m_Value(), m_ConstantInt(CI)))) ||
       (!isLeftShift && match(I, m_Shl(m_Value(), m_ConstantInt(CI))))) {
     if (CI->getZExtValue() == NumBits) {
-- 
2.34.1