X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FIRBuilder.h;h=1f4e598990d6f3f4fde09bd0e8947b5f28f6ee77;hb=2a22004f6857c57dc483ea6180f0e1f86854bd13;hp=cd0e1826b004fac94c7306375b941e93826ef521;hpb=9adc0abad3c3ed40a268ccbcee0c74cb9e1359fe;p=oota-llvm.git

diff --git a/include/llvm/Support/IRBuilder.h b/include/llvm/Support/IRBuilder.h
index cd0e1826b00..1f4e598990d 100644
--- a/include/llvm/Support/IRBuilder.h
+++ b/include/llvm/Support/IRBuilder.h
@@ -15,128 +15,220 @@
 #ifndef LLVM_SUPPORT_IRBUILDER_H
 #define LLVM_SUPPORT_IRBUILDER_H
 
-#include "llvm/Constants.h"
 #include "llvm/Instructions.h"
-#include "llvm/GlobalAlias.h"
-#include "llvm/GlobalVariable.h"
-#include "llvm/Function.h"
-#include "llvm/LLVMContext.h"
+#include "llvm/BasicBlock.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Support/ConstantFolder.h"
 
 namespace llvm {
+  class MDNode;
 
+/// IRBuilderDefaultInserter - This provides the default implementation of the
+/// IRBuilder 'InsertHelper' method that is called whenever an instruction is
+/// created by IRBuilder and needs to be inserted.  By default, this inserts the
+/// instruction at the insertion point.
+template <bool preserveNames = true>
+class IRBuilderDefaultInserter {
+protected:
+  void InsertHelper(Instruction *I, const Twine &Name,
+                    BasicBlock *BB, BasicBlock::iterator InsertPt) const {
+    if (BB) BB->getInstList().insert(InsertPt, I);
+    if (preserveNames)
+      I->setName(Name);
+  }
+};
+
+/// IRBuilderBase - Common base class shared among various IRBuilders.
+class IRBuilderBase {
+  unsigned DbgMDKind;
+  MDNode *CurDbgLocation;
+protected:
+  BasicBlock *BB;
+  BasicBlock::iterator InsertPt;
+  LLVMContext &Context;
+public:
+  
+  IRBuilderBase(LLVMContext &context)
+    : DbgMDKind(0), CurDbgLocation(0), Context(context) {
+    ClearInsertionPoint();
+  }
+  
+  //===--------------------------------------------------------------------===//
+  // Builder configuration methods
+  //===--------------------------------------------------------------------===//
+  
+  /// ClearInsertionPoint - Clear the insertion point: created instructions will
+  /// not be inserted into a block.
+  void ClearInsertionPoint() {
+    BB = 0;
+  }
+  
+  BasicBlock *GetInsertBlock() const { return BB; }
+  BasicBlock::iterator GetInsertPoint() const { return InsertPt; }
+  
+  /// SetInsertPoint - This specifies that created instructions should be
+  /// appended to the end of the specified block.
+  void SetInsertPoint(BasicBlock *TheBB) {
+    BB = TheBB;
+    InsertPt = BB->end();
+  }
+  
+  /// SetInsertPoint - This specifies that created instructions should be
+  /// inserted at the specified point.
+  void SetInsertPoint(BasicBlock *TheBB, BasicBlock::iterator IP) {
+    BB = TheBB;
+    InsertPt = IP;
+  }
+  
+  /// SetCurrentDebugLocation - Set location information used by debugging
+  /// information.
+  void SetCurrentDebugLocation(MDNode *L);
+  MDNode *getCurrentDebugLocation() const { return CurDbgLocation; }
+  
+  /// SetInstDebugLocation - If this builder has a current debug location, set
+  /// it on the specified instruction.
+  void SetInstDebugLocation(Instruction *I) const;
+
+  //===--------------------------------------------------------------------===//
+  // Miscellaneous creation methods.
+  //===--------------------------------------------------------------------===//
+  
+  /// CreateGlobalString - Make a new global variable with an initializer that
+  /// has array of i8 type filled in with the nul terminated string value
+  /// specified.  If Name is specified, it is the name of the global variable
+  /// created.
+  Value *CreateGlobalString(const char *Str = "", const Twine &Name = "");
+  
+  //===--------------------------------------------------------------------===//
+  // Type creation methods
+  //===--------------------------------------------------------------------===//
+  
+  /// getInt1Ty - Fetch the type representing a single bit
+  const Type *getInt1Ty() {
+    return Type::getInt1Ty(Context);
+  }
+  
+  /// getInt8Ty - Fetch the type representing an 8-bit integer.
+  const Type *getInt8Ty() {
+    return Type::getInt8Ty(Context);
+  }
+  
+  /// getInt16Ty - Fetch the type representing a 16-bit integer.
+  const Type *getInt16Ty() {
+    return Type::getInt16Ty(Context);
+  }
+  
+  /// getInt32Ty - Fetch the type resepresenting a 32-bit integer.
+  const Type *getInt32Ty() {
+    return Type::getInt32Ty(Context);
+  }
+  
+  /// getInt64Ty - Fetch the type representing a 64-bit integer.
+  const Type *getInt64Ty() {
+    return Type::getInt64Ty(Context);
+  }
+  
+  /// getFloatTy - Fetch the type representing a 32-bit floating point value.
+  const Type *getFloatTy() {
+    return Type::getFloatTy(Context);
+  }
+  
+  /// getDoubleTy - Fetch the type representing a 64-bit floating point value.
+  const Type *getDoubleTy() {
+    return Type::getDoubleTy(Context);
+  }
+  
+  /// getVoidTy - Fetch the type representing void.
+  const Type *getVoidTy() {
+    return Type::getVoidTy(Context);
+  }
+  
+  const Type *getInt8PtrTy() {
+    return Type::getInt8PtrTy(Context);
+  }
+  
+  /// getCurrentFunctionReturnType - Get the return type of the current function
+  /// that we're emitting into.
+  const Type *getCurrentFunctionReturnType() const;
+};
+  
 /// IRBuilder - This provides a uniform API for creating instructions and
 /// inserting them into a basic block: either at the end of a BasicBlock, or
 /// at a specific iterator location in a block.
 ///
 /// Note that the builder does not expose the full generality of LLVM
-/// instructions.  For example, it cannot be used to create instructions with
-/// arbitrary names (specifically, names with nul characters in them) - It only
-/// supports nul-terminated C strings.  For fully generic names, use
-/// I->setName().  For access to extra instruction properties, use the mutators
+/// instructions.  For access to extra instruction properties, use the mutators
 /// (e.g. setVolatile) on the instructions after they have been created.
 /// The first template argument handles whether or not to preserve names in the
 /// final instruction output. This defaults to on.  The second template argument
 /// specifies a class to use for creating constants.  This defaults to creating
-/// minimally folded constants.
-template <bool preserveNames=true, typename T = ConstantFolder> class IRBuilder{
-  BasicBlock *BB;
-  BasicBlock::iterator InsertPt;
-  LLVMContext &Context;
+/// minimally folded constants.  The fourth template argument allows clients to
+/// specify custom insertion hooks that are called on every newly created
+/// insertion.
+template<bool preserveNames = true, typename T = ConstantFolder,
+         typename Inserter = IRBuilderDefaultInserter<preserveNames> >
+class IRBuilder : public IRBuilderBase, public Inserter {
   T Folder;
 public:
-  IRBuilder(LLVMContext &C, const T& F) :
-    Context(C), Folder(F) { ClearInsertionPoint(); }
+  IRBuilder(LLVMContext &C, const T &F, const Inserter &I = Inserter())
+    : IRBuilderBase(C), Inserter(I), Folder(F) {
+  }
   
-  IRBuilder(LLVMContext &C) : Context(C), Folder(C) { ClearInsertionPoint(); }
+  explicit IRBuilder(LLVMContext &C) : IRBuilderBase(C), Folder(C) {
+  }
   
-  explicit IRBuilder(BasicBlock *TheBB, const T& F)
-      : Context(*TheBB->getParent()->getContext()), Folder(F) {
+  explicit IRBuilder(BasicBlock *TheBB, const T &F)
+    : IRBuilderBase(TheBB->getContext()), Folder(F) {
     SetInsertPoint(TheBB);
   }
   
   explicit IRBuilder(BasicBlock *TheBB)
-      : Context(*TheBB->getParent()->getContext()), Folder(Context) {
+    : IRBuilderBase(TheBB->getContext()), Folder(Context) {
     SetInsertPoint(TheBB);
   }
   
   IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP, const T& F)
-      : Context(*TheBB->getParent()->getContext()), Folder(F) {
+    : IRBuilderBase(TheBB->getContext()), Folder(F) {
     SetInsertPoint(TheBB, IP);
   }
   
   IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP)
-      : Context(*TheBB->getParent()->getContext()), Folder(Context) {
+    : IRBuilderBase(TheBB->getContext()), Folder(Context) {
     SetInsertPoint(TheBB, IP);
   }
 
   /// getFolder - Get the constant folder being used.
-  const T& getFolder() { return Folder; }
+  const T &getFolder() { return Folder; }
 
   /// isNamePreserving - Return true if this builder is configured to actually
   /// add the requested names to IR created through it.
   bool isNamePreserving() const { return preserveNames; }
   
-  //===--------------------------------------------------------------------===//
-  // Builder configuration methods
-  //===--------------------------------------------------------------------===//
-
-  /// ClearInsertionPoint - Clear the insertion point: created instructions will
-  /// not be inserted into a block.
-  void ClearInsertionPoint() {
-    BB = 0;
-  }
-
-  BasicBlock *GetInsertBlock() const { return BB; }
-
-  BasicBlock::iterator GetInsertPoint() const { return InsertPt; }
-
-  /// SetInsertPoint - This specifies that created instructions should be
-  /// appended to the end of the specified block.
-  void SetInsertPoint(BasicBlock *TheBB) {
-    BB = TheBB;
-    InsertPt = BB->end();
-  }
-
-  /// SetInsertPoint - This specifies that created instructions should be
-  /// inserted at the specified point.
-  void SetInsertPoint(BasicBlock *TheBB, BasicBlock::iterator IP) {
-    BB = TheBB;
-    InsertPt = IP;
-  }
-
   /// Insert - Insert and return the specified instruction.
   template<typename InstTy>
-  InstTy *Insert(InstTy *I, const char *Name = "") const {
-    InsertHelper(I, Name);
+  InstTy *Insert(InstTy *I, const Twine &Name = "") const {
+    this->InsertHelper(I, Name, BB, InsertPt);
+    if (getCurrentDebugLocation() != 0)
+      this->SetInstDebugLocation(I);
     return I;
   }
 
-  /// InsertHelper - Insert the specified instruction at the specified insertion
-  /// point.  This is split out of Insert so that it isn't duplicated for every
-  /// template instantiation.
-  void InsertHelper(Instruction *I, const char *Name) const {
-    if (BB) BB->getInstList().insert(InsertPt, I);
-    if (preserveNames && Name[0])
-      I->setName(Name);
-  }
-
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Terminators
   //===--------------------------------------------------------------------===//
 
   /// CreateRetVoid - Create a 'ret void' instruction.
   ReturnInst *CreateRetVoid() {
-    return Insert(ReturnInst::Create());
+    return Insert(ReturnInst::Create(Context));
   }
 
   /// @verbatim
   /// CreateRet - Create a 'ret <val>' instruction.
   /// @endverbatim
   ReturnInst *CreateRet(Value *V) {
-    return Insert(ReturnInst::Create(V));
+    return Insert(ReturnInst::Create(Context, V));
   }
-
+  
   /// CreateAggregateRet - Create a sequence of N insertvalue instructions,
   /// with one Value from the retVals array each, that build a aggregate
   /// return value one value at a time, and a ret instruction to return
@@ -144,12 +236,11 @@ public:
   /// code that uses aggregate return values as a vehicle for having
   /// multiple return values.
   ///
-  ReturnInst *CreateAggregateRet(Value * const* retVals, unsigned N) {
-    const Type *RetType = BB->getParent()->getReturnType();
-    Value *V = Context.getUndef(RetType);
+  ReturnInst *CreateAggregateRet(Value *const *retVals, unsigned N) {
+    Value *V = UndefValue::get(getCurrentFunctionReturnType());
     for (unsigned i = 0; i != N; ++i)
       V = CreateInsertValue(V, retVals[i], i, "mrv");
-    return Insert(ReturnInst::Create(V));
+    return Insert(ReturnInst::Create(Context, V));
   }
 
   /// CreateBr - Create an unconditional 'br label X' instruction.
@@ -170,130 +261,227 @@ public:
     return Insert(SwitchInst::Create(V, Dest, NumCases));
   }
 
+  /// CreateIndirectBr - Create an indirect branch instruction with the
+  /// specified address operand, with an optional hint for the number of
+  /// destinations that will be added (for efficient allocation).
+  IndirectBrInst *CreateIndirectBr(Value *Addr, unsigned NumDests = 10) {
+    return Insert(IndirectBrInst::Create(Addr, NumDests));
+  }
+
+  InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
+                           BasicBlock *UnwindDest, const Twine &Name = "") {
+    Value *Args[] = { 0 };
+    return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest, Args,
+                                     Args), Name);
+  }
+  InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
+                           BasicBlock *UnwindDest, Value *Arg1,
+                           const Twine &Name = "") {
+    Value *Args[] = { Arg1 };
+    return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest, Args,
+                                     Args+1), Name);
+  }
+  InvokeInst *CreateInvoke3(Value *Callee, BasicBlock *NormalDest,
+                            BasicBlock *UnwindDest, Value *Arg1,
+                            Value *Arg2, Value *Arg3,
+                            const Twine &Name = "") {
+    Value *Args[] = { Arg1, Arg2, Arg3 };
+    return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest, Args,
+                                     Args+3), Name);
+  }
   /// CreateInvoke - Create an invoke instruction.
   template<typename InputIterator>
   InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
                            BasicBlock *UnwindDest, InputIterator ArgBegin,
-                           InputIterator ArgEnd, const char *Name = "") {
+                           InputIterator ArgEnd, const Twine &Name = "") {
     return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest,
                                      ArgBegin, ArgEnd), Name);
   }
 
   UnwindInst *CreateUnwind() {
-    return Insert(new UnwindInst());
+    return Insert(new UnwindInst(Context));
   }
 
   UnreachableInst *CreateUnreachable() {
-    return Insert(new UnreachableInst());
+    return Insert(new UnreachableInst(Context));
   }
 
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Binary Operators
   //===--------------------------------------------------------------------===//
 
-  Value *CreateAdd(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateAdd(LC, RC);
     return Insert(BinaryOperator::CreateAdd(LHS, RHS), Name);
   }
-  Value *CreateFAdd(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateNSWAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNSWAdd(LC, RC);
+    return Insert(BinaryOperator::CreateNSWAdd(LHS, RHS), Name);
+  }
+  Value *CreateNUWAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNUWAdd(LC, RC);
+    return Insert(BinaryOperator::CreateNUWAdd(LHS, RHS), Name);
+  }
+  Value *CreateFAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFAdd(LC, RC);
     return Insert(BinaryOperator::CreateFAdd(LHS, RHS), Name);
   }
-  Value *CreateSub(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateSub(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateSub(LC, RC);
     return Insert(BinaryOperator::CreateSub(LHS, RHS), Name);
   }
-  Value *CreateFSub(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateNSWSub(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNSWSub(LC, RC);
+    return Insert(BinaryOperator::CreateNSWSub(LHS, RHS), Name);
+  }
+  Value *CreateNUWSub(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNUWSub(LC, RC);
+    return Insert(BinaryOperator::CreateNUWSub(LHS, RHS), Name);
+  }
+  Value *CreateFSub(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFSub(LC, RC);
     return Insert(BinaryOperator::CreateFSub(LHS, RHS), Name);
   }
-  Value *CreateMul(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateMul(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateMul(LC, RC);
     return Insert(BinaryOperator::CreateMul(LHS, RHS), Name);
   }
-  Value *CreateFMul(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateNSWMul(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNSWMul(LC, RC);
+    return Insert(BinaryOperator::CreateNSWMul(LHS, RHS), Name);
+  }
+  Value *CreateNUWMul(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNUWMul(LC, RC);
+    return Insert(BinaryOperator::CreateNUWMul(LHS, RHS), Name);
+  }
+  Value *CreateFMul(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFMul(LC, RC);
     return Insert(BinaryOperator::CreateFMul(LHS, RHS), Name);
   }
-  Value *CreateUDiv(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateUDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateUDiv(LC, RC);
     return Insert(BinaryOperator::CreateUDiv(LHS, RHS), Name);
   }
-  Value *CreateSDiv(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateSDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateSDiv(LC, RC);
     return Insert(BinaryOperator::CreateSDiv(LHS, RHS), Name);
   }
-  Value *CreateFDiv(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateExactSDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateExactSDiv(LC, RC);
+    return Insert(BinaryOperator::CreateExactSDiv(LHS, RHS), Name);
+  }
+  Value *CreateFDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFDiv(LC, RC);
     return Insert(BinaryOperator::CreateFDiv(LHS, RHS), Name);
   }
-  Value *CreateURem(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateURem(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateURem(LC, RC);
     return Insert(BinaryOperator::CreateURem(LHS, RHS), Name);
   }
-  Value *CreateSRem(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateSRem(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateSRem(LC, RC);
     return Insert(BinaryOperator::CreateSRem(LHS, RHS), Name);
   }
-  Value *CreateFRem(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFRem(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFRem(LC, RC);
     return Insert(BinaryOperator::CreateFRem(LHS, RHS), Name);
   }
-  Value *CreateShl(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateShl(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateShl(LC, RC);
     return Insert(BinaryOperator::CreateShl(LHS, RHS), Name);
   }
-  Value *CreateLShr(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateShl(Value *LHS, uint64_t RHS, const Twine &Name = "") {
+    Constant *RHSC = ConstantInt::get(LHS->getType(), RHS);
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      return Folder.CreateShl(LC, RHSC);
+    return Insert(BinaryOperator::CreateShl(LHS, RHSC), Name);
+  }
+
+  Value *CreateLShr(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateLShr(LC, RC);
     return Insert(BinaryOperator::CreateLShr(LHS, RHS), Name);
   }
-  Value *CreateAShr(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateLShr(Value *LHS, uint64_t RHS, const Twine &Name = "") {
+    Constant *RHSC = ConstantInt::get(LHS->getType(), RHS);
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      return Folder.CreateLShr(LC, RHSC);
+    return Insert(BinaryOperator::CreateLShr(LHS, RHSC), Name);
+  }
+  
+  Value *CreateAShr(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateAShr(LC, RC);
     return Insert(BinaryOperator::CreateAShr(LHS, RHS), Name);
   }
-  Value *CreateAnd(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateAShr(Value *LHS, uint64_t RHS, const Twine &Name = "") {
+    Constant *RHSC = ConstantInt::get(LHS->getType(), RHS);
     if (Constant *LC = dyn_cast<Constant>(LHS))
-      if (Constant *RC = dyn_cast<Constant>(RHS))
+      return Folder.CreateSShr(LC, RHSC);
+    return Insert(BinaryOperator::CreateAShr(LHS, RHSC), Name);
+  }
+
+  Value *CreateAnd(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *RC = dyn_cast<Constant>(RHS)) {
+      if (isa<ConstantInt>(RC) && cast<ConstantInt>(RC)->isAllOnesValue())
+        return LHS;  // LHS & -1 -> LHS
+      if (Constant *LC = dyn_cast<Constant>(LHS))
         return Folder.CreateAnd(LC, RC);
+    }
     return Insert(BinaryOperator::CreateAnd(LHS, RHS), Name);
   }
-  Value *CreateOr(Value *LHS, Value *RHS, const char *Name = "") {
-    if (Constant *LC = dyn_cast<Constant>(LHS))
-      if (Constant *RC = dyn_cast<Constant>(RHS))
+  Value *CreateOr(Value *LHS, Value *RHS, const Twine &Name = "") {
+    if (Constant *RC = dyn_cast<Constant>(RHS)) {
+      if (RC->isNullValue())
+        return LHS;  // LHS | 0 -> LHS
+      if (Constant *LC = dyn_cast<Constant>(LHS))
         return Folder.CreateOr(LC, RC);
+    }
     return Insert(BinaryOperator::CreateOr(LHS, RHS), Name);
   }
-  Value *CreateXor(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateXor(Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateXor(LC, RC);
@@ -301,48 +489,56 @@ public:
   }
 
   Value *CreateBinOp(Instruction::BinaryOps Opc,
-                     Value *LHS, Value *RHS, const char *Name = "") {
+                     Value *LHS, Value *RHS, const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateBinOp(Opc, LC, RC);
     return Insert(BinaryOperator::Create(Opc, LHS, RHS), Name);
   }
 
-  Value *CreateNeg(Value *V, const char *Name = "") {
+  Value *CreateNeg(Value *V, const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateNeg(VC);
-    return Insert(BinaryOperator::CreateNeg(Context, V), Name);
+    return Insert(BinaryOperator::CreateNeg(V), Name);
+  }
+  Value *CreateNSWNeg(Value *V, const Twine &Name = "") {
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateNSWNeg(VC);
+    return Insert(BinaryOperator::CreateNSWNeg(V), Name);
+  }
+  Value *CreateNUWNeg(Value *V, const Twine &Name = "") {
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateNUWNeg(VC);
+    return Insert(BinaryOperator::CreateNUWNeg(V), Name);
   }
-  Value *CreateFNeg(Value *V, const char *Name = "") {
+  Value *CreateFNeg(Value *V, const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateFNeg(VC);
-    return Insert(BinaryOperator::CreateFNeg(Context, V), Name);
+    return Insert(BinaryOperator::CreateFNeg(V), Name);
   }
-  Value *CreateNot(Value *V, const char *Name = "") {
+  Value *CreateNot(Value *V, const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateNot(VC);
-    return Insert(BinaryOperator::CreateNot(Context, V), Name);
+    return Insert(BinaryOperator::CreateNot(V), Name);
   }
 
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Memory Instructions
   //===--------------------------------------------------------------------===//
 
-  MallocInst *CreateMalloc(const Type *Ty, Value *ArraySize = 0,
-                           const char *Name = "") {
-    return Insert(new MallocInst(Context, Ty, ArraySize), Name);
-  }
   AllocaInst *CreateAlloca(const Type *Ty, Value *ArraySize = 0,
-                           const char *Name = "") {
-    return Insert(new AllocaInst(Context, Ty, ArraySize), Name);
+                           const Twine &Name = "") {
+    return Insert(new AllocaInst(Ty, ArraySize), Name);
   }
-  FreeInst *CreateFree(Value *Ptr) {
-    return Insert(new FreeInst(Ptr));
+  // Provided to resolve 'CreateLoad(Ptr, "...")' correctly, instead of
+  // converting the string to 'bool' for the isVolatile parameter.
+  LoadInst *CreateLoad(Value *Ptr, const char *Name) {
+    return Insert(new LoadInst(Ptr), Name);
   }
-  LoadInst *CreateLoad(Value *Ptr, const char *Name = "") {
+  LoadInst *CreateLoad(Value *Ptr, const Twine &Name = "") {
     return Insert(new LoadInst(Ptr), Name);
   }
-  LoadInst *CreateLoad(Value *Ptr, bool isVolatile, const char *Name = "") {
+  LoadInst *CreateLoad(Value *Ptr, bool isVolatile, const Twine &Name = "") {
     return Insert(new LoadInst(Ptr, 0, isVolatile), Name);
   }
   StoreInst *CreateStore(Value *Val, Value *Ptr, bool isVolatile = false) {
@@ -350,38 +546,69 @@ public:
   }
   template<typename InputIterator>
   Value *CreateGEP(Value *Ptr, InputIterator IdxBegin, InputIterator IdxEnd,
-                   const char *Name = "") {
+                   const Twine &Name = "") {
     if (Constant *PC = dyn_cast<Constant>(Ptr)) {
       // Every index must be constant.
       InputIterator i;
-      for (i = IdxBegin; i < IdxEnd; ++i) {
-        if (!dyn_cast<Constant>(*i))
+      for (i = IdxBegin; i < IdxEnd; ++i)
+        if (!isa<Constant>(*i))
           break;
-      }
       if (i == IdxEnd)
         return Folder.CreateGetElementPtr(PC, &IdxBegin[0], IdxEnd - IdxBegin);
     }
     return Insert(GetElementPtrInst::Create(Ptr, IdxBegin, IdxEnd), Name);
   }
-  Value *CreateGEP(Value *Ptr, Value *Idx, const char *Name = "") {
+  template<typename InputIterator>
+  Value *CreateInBoundsGEP(Value *Ptr, InputIterator IdxBegin, InputIterator IdxEnd,
+                           const Twine &Name = "") {
+    if (Constant *PC = dyn_cast<Constant>(Ptr)) {
+      // Every index must be constant.
+      InputIterator i;
+      for (i = IdxBegin; i < IdxEnd; ++i)
+        if (!isa<Constant>(*i))
+          break;
+      if (i == IdxEnd)
+        return Folder.CreateInBoundsGetElementPtr(PC,
+                                                  &IdxBegin[0],
+                                                  IdxEnd - IdxBegin);
+    }
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, IdxBegin, IdxEnd),
+                  Name);
+  }
+  Value *CreateGEP(Value *Ptr, Value *Idx, const Twine &Name = "") {
     if (Constant *PC = dyn_cast<Constant>(Ptr))
       if (Constant *IC = dyn_cast<Constant>(Idx))
         return Folder.CreateGetElementPtr(PC, &IC, 1);
     return Insert(GetElementPtrInst::Create(Ptr, Idx), Name);
   }
-  Value *CreateConstGEP1_32(Value *Ptr, unsigned Idx0, const char *Name = "") {
-    Value *Idx = Context.getConstantInt(Type::Int32Ty, Idx0);
+  Value *CreateInBoundsGEP(Value *Ptr, Value *Idx, const Twine &Name = "") {
+    if (Constant *PC = dyn_cast<Constant>(Ptr))
+      if (Constant *IC = dyn_cast<Constant>(Idx))
+        return Folder.CreateInBoundsGetElementPtr(PC, &IC, 1);
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, Idx), Name);
+  }
+  Value *CreateConstGEP1_32(Value *Ptr, unsigned Idx0, const Twine &Name = "") {
+    Value *Idx = ConstantInt::get(Type::getInt32Ty(Context), Idx0);
 
     if (Constant *PC = dyn_cast<Constant>(Ptr))
       return Folder.CreateGetElementPtr(PC, &Idx, 1);
 
     return Insert(GetElementPtrInst::Create(Ptr, &Idx, &Idx+1), Name);    
   }
+  Value *CreateConstInBoundsGEP1_32(Value *Ptr, unsigned Idx0,
+                                    const Twine &Name = "") {
+    Value *Idx = ConstantInt::get(Type::getInt32Ty(Context), Idx0);
+
+    if (Constant *PC = dyn_cast<Constant>(Ptr))
+      return Folder.CreateInBoundsGetElementPtr(PC, &Idx, 1);
+
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, &Idx, &Idx+1), Name);
+  }
   Value *CreateConstGEP2_32(Value *Ptr, unsigned Idx0, unsigned Idx1, 
-                    const char *Name = "") {
+                    const Twine &Name = "") {
     Value *Idxs[] = {
-      Context.getConstantInt(Type::Int32Ty, Idx0),
-      Context.getConstantInt(Type::Int32Ty, Idx1)
+      ConstantInt::get(Type::getInt32Ty(Context), Idx0),
+      ConstantInt::get(Type::getInt32Ty(Context), Idx1)
     };
 
     if (Constant *PC = dyn_cast<Constant>(Ptr))
@@ -389,19 +616,40 @@ public:
 
     return Insert(GetElementPtrInst::Create(Ptr, Idxs, Idxs+2), Name);    
   }
-  Value *CreateConstGEP1_64(Value *Ptr, uint64_t Idx0, const char *Name = "") {
-    Value *Idx = Context.getConstantInt(Type::Int64Ty, Idx0);
+  Value *CreateConstInBoundsGEP2_32(Value *Ptr, unsigned Idx0, unsigned Idx1,
+                                    const Twine &Name = "") {
+    Value *Idxs[] = {
+      ConstantInt::get(Type::getInt32Ty(Context), Idx0),
+      ConstantInt::get(Type::getInt32Ty(Context), Idx1)
+    };
+
+    if (Constant *PC = dyn_cast<Constant>(Ptr))
+      return Folder.CreateInBoundsGetElementPtr(PC, Idxs, 2);
+
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, Idxs, Idxs+2), Name);
+  }
+  Value *CreateConstGEP1_64(Value *Ptr, uint64_t Idx0, const Twine &Name = "") {
+    Value *Idx = ConstantInt::get(Type::getInt64Ty(Context), Idx0);
 
     if (Constant *PC = dyn_cast<Constant>(Ptr))
       return Folder.CreateGetElementPtr(PC, &Idx, 1);
 
     return Insert(GetElementPtrInst::Create(Ptr, &Idx, &Idx+1), Name);    
   }
-  Value *CreateConstGEP2_64(Value *Ptr, uint64_t Idx0, uint64_t Idx1, 
-                    const char *Name = "") {
+  Value *CreateConstInBoundsGEP1_64(Value *Ptr, uint64_t Idx0,
+                                    const Twine &Name = "") {
+    Value *Idx = ConstantInt::get(Type::getInt64Ty(Context), Idx0);
+
+    if (Constant *PC = dyn_cast<Constant>(Ptr))
+      return Folder.CreateInBoundsGetElementPtr(PC, &Idx, 1);
+
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, &Idx, &Idx+1), Name);
+  }
+  Value *CreateConstGEP2_64(Value *Ptr, uint64_t Idx0, uint64_t Idx1,
+                    const Twine &Name = "") {
     Value *Idxs[] = {
-      Context.getConstantInt(Type::Int64Ty, Idx0),
-      Context.getConstantInt(Type::Int64Ty, Idx1)
+      ConstantInt::get(Type::getInt64Ty(Context), Idx0),
+      ConstantInt::get(Type::getInt64Ty(Context), Idx1)
     };
 
     if (Constant *PC = dyn_cast<Constant>(Ptr))
@@ -409,222 +657,267 @@ public:
 
     return Insert(GetElementPtrInst::Create(Ptr, Idxs, Idxs+2), Name);    
   }
-  Value *CreateStructGEP(Value *Ptr, unsigned Idx, const char *Name = "") {
-    return CreateConstGEP2_32(Ptr, 0, Idx, Name);
-  }
-  Value *CreateGlobalString(const char *Str = "", const char *Name = "") {
-    Constant *StrConstant = Context.getConstantArray(Str, true);
-    Module &M = *BB->getParent()->getParent();
-    GlobalVariable *gv = new GlobalVariable(M,
-                                            StrConstant->getType(),
-                                            true,
-                                            GlobalValue::InternalLinkage,
-                                            StrConstant,
-                                            "",
-                                            0,
-                                            false);
-    gv->setName(Name);
-    return gv;
-  }
-  Value *CreateGlobalStringPtr(const char *Str = "", const char *Name = "") {
+  Value *CreateConstInBoundsGEP2_64(Value *Ptr, uint64_t Idx0, uint64_t Idx1,
+                                    const Twine &Name = "") {
+    Value *Idxs[] = {
+      ConstantInt::get(Type::getInt64Ty(Context), Idx0),
+      ConstantInt::get(Type::getInt64Ty(Context), Idx1)
+    };
+
+    if (Constant *PC = dyn_cast<Constant>(Ptr))
+      return Folder.CreateInBoundsGetElementPtr(PC, Idxs, 2);
+
+    return Insert(GetElementPtrInst::CreateInBounds(Ptr, Idxs, Idxs+2), Name);
+  }
+  Value *CreateStructGEP(Value *Ptr, unsigned Idx, const Twine &Name = "") {
+    return CreateConstInBoundsGEP2_32(Ptr, 0, Idx, Name);
+  }
+  
+  /// CreateGlobalStringPtr - Same as CreateGlobalString, but return a pointer
+  /// with "i8*" type instead of a pointer to array of i8.
+  Value *CreateGlobalStringPtr(const char *Str = "", const Twine &Name = "") {
     Value *gv = CreateGlobalString(Str, Name);
-    Value *zero = Context.getConstantInt(Type::Int32Ty, 0);
+    Value *zero = ConstantInt::get(Type::getInt32Ty(Context), 0);
     Value *Args[] = { zero, zero };
-    return CreateGEP(gv, Args, Args+2, Name);
+    return CreateInBoundsGEP(gv, Args, Args+2, Name);
   }
+  
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Cast/Conversion Operators
   //===--------------------------------------------------------------------===//
 
-  Value *CreateTrunc(Value *V, const Type *DestTy, const char *Name = "") {
+  Value *CreateTrunc(Value *V, const Type *DestTy, const Twine &Name = "") {
     return CreateCast(Instruction::Trunc, V, DestTy, Name);
   }
-  Value *CreateZExt(Value *V, const Type *DestTy, const char *Name = "") {
+  Value *CreateZExt(Value *V, const Type *DestTy, const Twine &Name = "") {
     return CreateCast(Instruction::ZExt, V, DestTy, Name);
   }
-  Value *CreateSExt(Value *V, const Type *DestTy, const char *Name = "") {
+  Value *CreateSExt(Value *V, const Type *DestTy, const Twine &Name = "") {
     return CreateCast(Instruction::SExt, V, DestTy, Name);
   }
-  Value *CreateFPToUI(Value *V, const Type *DestTy, const char *Name = ""){
+  Value *CreateFPToUI(Value *V, const Type *DestTy, const Twine &Name = ""){
     return CreateCast(Instruction::FPToUI, V, DestTy, Name);
   }
-  Value *CreateFPToSI(Value *V, const Type *DestTy, const char *Name = ""){
+  Value *CreateFPToSI(Value *V, const Type *DestTy, const Twine &Name = ""){
     return CreateCast(Instruction::FPToSI, V, DestTy, Name);
   }
-  Value *CreateUIToFP(Value *V, const Type *DestTy, const char *Name = ""){
+  Value *CreateUIToFP(Value *V, const Type *DestTy, const Twine &Name = ""){
     return CreateCast(Instruction::UIToFP, V, DestTy, Name);
   }
-  Value *CreateSIToFP(Value *V, const Type *DestTy, const char *Name = ""){
+  Value *CreateSIToFP(Value *V, const Type *DestTy, const Twine &Name = ""){
     return CreateCast(Instruction::SIToFP, V, DestTy, Name);
   }
   Value *CreateFPTrunc(Value *V, const Type *DestTy,
-                       const char *Name = "") {
+                       const Twine &Name = "") {
     return CreateCast(Instruction::FPTrunc, V, DestTy, Name);
   }
-  Value *CreateFPExt(Value *V, const Type *DestTy, const char *Name = "") {
+  Value *CreateFPExt(Value *V, const Type *DestTy, const Twine &Name = "") {
     return CreateCast(Instruction::FPExt, V, DestTy, Name);
   }
   Value *CreatePtrToInt(Value *V, const Type *DestTy,
-                        const char *Name = "") {
+                        const Twine &Name = "") {
     return CreateCast(Instruction::PtrToInt, V, DestTy, Name);
   }
   Value *CreateIntToPtr(Value *V, const Type *DestTy,
-                        const char *Name = "") {
+                        const Twine &Name = "") {
     return CreateCast(Instruction::IntToPtr, V, DestTy, Name);
   }
   Value *CreateBitCast(Value *V, const Type *DestTy,
-                       const char *Name = "") {
+                       const Twine &Name = "") {
     return CreateCast(Instruction::BitCast, V, DestTy, Name);
   }
-
+  Value *CreateZExtOrBitCast(Value *V, const Type *DestTy,
+                             const Twine &Name = "") {
+    if (V->getType() == DestTy)
+      return V;
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateZExtOrBitCast(VC, DestTy);
+    return Insert(CastInst::CreateZExtOrBitCast(V, DestTy), Name);
+  }
+  Value *CreateSExtOrBitCast(Value *V, const Type *DestTy,
+                             const Twine &Name = "") {
+    if (V->getType() == DestTy)
+      return V;
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateSExtOrBitCast(VC, DestTy);
+    return Insert(CastInst::CreateSExtOrBitCast(V, DestTy), Name);
+  }
+  Value *CreateTruncOrBitCast(Value *V, const Type *DestTy,
+                              const Twine &Name = "") {
+    if (V->getType() == DestTy)
+      return V;
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateTruncOrBitCast(VC, DestTy);
+    return Insert(CastInst::CreateTruncOrBitCast(V, DestTy), Name);
+  }
   Value *CreateCast(Instruction::CastOps Op, Value *V, const Type *DestTy,
-                    const char *Name = "") {
+                    const Twine &Name = "") {
     if (V->getType() == DestTy)
       return V;
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateCast(Op, VC, DestTy);
     return Insert(CastInst::Create(Op, V, DestTy), Name);
   }
+  Value *CreatePointerCast(Value *V, const Type *DestTy,
+                           const Twine &Name = "") {
+    if (V->getType() == DestTy)
+      return V;
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreatePointerCast(VC, DestTy);
+    return Insert(CastInst::CreatePointerCast(V, DestTy), Name);
+  }
   Value *CreateIntCast(Value *V, const Type *DestTy, bool isSigned,
-                       const char *Name = "") {
+                       const Twine &Name = "") {
     if (V->getType() == DestTy)
       return V;
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateIntCast(VC, DestTy, isSigned);
     return Insert(CastInst::CreateIntegerCast(V, DestTy, isSigned), Name);
   }
+private:
+  // Provided to resolve 'CreateIntCast(Ptr, Ptr, "...")', giving a compile time
+  // error, instead of converting the string to bool for the isSigned parameter.
+  Value *CreateIntCast(Value *, const Type *, const char *); // DO NOT IMPLEMENT
+public:
+  Value *CreateFPCast(Value *V, const Type *DestTy, const Twine &Name = "") {
+    if (V->getType() == DestTy)
+      return V;
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateFPCast(VC, DestTy);
+    return Insert(CastInst::CreateFPCast(V, DestTy), Name);
+  }
 
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Compare Instructions
   //===--------------------------------------------------------------------===//
 
-  Value *CreateICmpEQ(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpEQ(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_EQ, LHS, RHS, Name);
   }
-  Value *CreateICmpNE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpNE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_NE, LHS, RHS, Name);
   }
-  Value *CreateICmpUGT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpUGT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_UGT, LHS, RHS, Name);
   }
-  Value *CreateICmpUGE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpUGE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_UGE, LHS, RHS, Name);
   }
-  Value *CreateICmpULT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpULT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_ULT, LHS, RHS, Name);
   }
-  Value *CreateICmpULE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpULE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_ULE, LHS, RHS, Name);
   }
-  Value *CreateICmpSGT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpSGT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_SGT, LHS, RHS, Name);
   }
-  Value *CreateICmpSGE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpSGE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_SGE, LHS, RHS, Name);
   }
-  Value *CreateICmpSLT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpSLT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_SLT, LHS, RHS, Name);
   }
-  Value *CreateICmpSLE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateICmpSLE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateICmp(ICmpInst::ICMP_SLE, LHS, RHS, Name);
   }
 
-  Value *CreateFCmpOEQ(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpOEQ(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_OEQ, LHS, RHS, Name);
   }
-  Value *CreateFCmpOGT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpOGT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_OGT, LHS, RHS, Name);
   }
-  Value *CreateFCmpOGE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpOGE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_OGE, LHS, RHS, Name);
   }
-  Value *CreateFCmpOLT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpOLT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_OLT, LHS, RHS, Name);
   }
-  Value *CreateFCmpOLE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpOLE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_OLE, LHS, RHS, Name);
   }
-  Value *CreateFCmpONE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpONE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_ONE, LHS, RHS, Name);
   }
-  Value *CreateFCmpORD(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpORD(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_ORD, LHS, RHS, Name);
   }
-  Value *CreateFCmpUNO(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpUNO(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_UNO, LHS, RHS, Name);
   }
-  Value *CreateFCmpUEQ(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpUEQ(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_UEQ, LHS, RHS, Name);
   }
-  Value *CreateFCmpUGT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpUGT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_UGT, LHS, RHS, Name);
   }
-  Value *CreateFCmpUGE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpUGE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_UGE, LHS, RHS, Name);
   }
-  Value *CreateFCmpULT(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpULT(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_ULT, LHS, RHS, Name);
   }
-  Value *CreateFCmpULE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpULE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_ULE, LHS, RHS, Name);
   }
-  Value *CreateFCmpUNE(Value *LHS, Value *RHS, const char *Name = "") {
+  Value *CreateFCmpUNE(Value *LHS, Value *RHS, const Twine &Name = "") {
     return CreateFCmp(FCmpInst::FCMP_UNE, LHS, RHS, Name);
   }
 
   Value *CreateICmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
-                    const char *Name = "") {
+                    const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateICmp(P, LC, RC);
-    return Insert(new ICmpInst(Context, P, LHS, RHS), Name);
+    return Insert(new ICmpInst(P, LHS, RHS), Name);
   }
   Value *CreateFCmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
-                    const char *Name = "") {
+                    const Twine &Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
         return Folder.CreateFCmp(P, LC, RC);
-    return Insert(new FCmpInst(Context, P, LHS, RHS), Name);
+    return Insert(new FCmpInst(P, LHS, RHS), Name);
   }
 
   //===--------------------------------------------------------------------===//
   // Instruction creation methods: Other Instructions
   //===--------------------------------------------------------------------===//
 
-  PHINode *CreatePHI(const Type *Ty, const char *Name = "") {
+  PHINode *CreatePHI(const Type *Ty, const Twine &Name = "") {
     return Insert(PHINode::Create(Ty), Name);
   }
 
-  CallInst *CreateCall(Value *Callee, const char *Name = "") {
+  CallInst *CreateCall(Value *Callee, const Twine &Name = "") {
     return Insert(CallInst::Create(Callee), Name);
   }
-  CallInst *CreateCall(Value *Callee, Value *Arg, const char *Name = "") {
+  CallInst *CreateCall(Value *Callee, Value *Arg, const Twine &Name = "") {
     return Insert(CallInst::Create(Callee, Arg), Name);
   }
   CallInst *CreateCall2(Value *Callee, Value *Arg1, Value *Arg2,
-                        const char *Name = "") {
+                        const Twine &Name = "") {
     Value *Args[] = { Arg1, Arg2 };
     return Insert(CallInst::Create(Callee, Args, Args+2), Name);
   }
   CallInst *CreateCall3(Value *Callee, Value *Arg1, Value *Arg2, Value *Arg3,
-                        const char *Name = "") {
+                        const Twine &Name = "") {
     Value *Args[] = { Arg1, Arg2, Arg3 };
     return Insert(CallInst::Create(Callee, Args, Args+3), Name);
   }
   CallInst *CreateCall4(Value *Callee, Value *Arg1, Value *Arg2, Value *Arg3,
-                        Value *Arg4, const char *Name = "") {
+                        Value *Arg4, const Twine &Name = "") {
     Value *Args[] = { Arg1, Arg2, Arg3, Arg4 };
     return Insert(CallInst::Create(Callee, Args, Args+4), Name);
   }
 
   template<typename InputIterator>
   CallInst *CreateCall(Value *Callee, InputIterator ArgBegin,
-                       InputIterator ArgEnd, const char *Name = "") {
+                       InputIterator ArgEnd, const Twine &Name = "") {
     return Insert(CallInst::Create(Callee, ArgBegin, ArgEnd), Name);
   }
 
   Value *CreateSelect(Value *C, Value *True, Value *False,
-                      const char *Name = "") {
+                      const Twine &Name = "") {
     if (Constant *CC = dyn_cast<Constant>(C))
       if (Constant *TC = dyn_cast<Constant>(True))
         if (Constant *FC = dyn_cast<Constant>(False))
@@ -632,20 +925,20 @@ public:
     return Insert(SelectInst::Create(C, True, False), Name);
   }
 
-  VAArgInst *CreateVAArg(Value *List, const Type *Ty, const char *Name = "") {
+  VAArgInst *CreateVAArg(Value *List, const Type *Ty, const Twine &Name = "") {
     return Insert(new VAArgInst(List, Ty), Name);
   }
 
   Value *CreateExtractElement(Value *Vec, Value *Idx,
-                              const char *Name = "") {
+                              const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(Vec))
       if (Constant *IC = dyn_cast<Constant>(Idx))
         return Folder.CreateExtractElement(VC, IC);
-    return Insert(new ExtractElementInst(Vec, Idx), Name);
+    return Insert(ExtractElementInst::Create(Vec, Idx), Name);
   }
 
   Value *CreateInsertElement(Value *Vec, Value *NewElt, Value *Idx,
-                             const char *Name = "") {
+                             const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(Vec))
       if (Constant *NC = dyn_cast<Constant>(NewElt))
         if (Constant *IC = dyn_cast<Constant>(Idx))
@@ -654,7 +947,7 @@ public:
   }
 
   Value *CreateShuffleVector(Value *V1, Value *V2, Value *Mask,
-                             const char *Name = "") {
+                             const Twine &Name = "") {
     if (Constant *V1C = dyn_cast<Constant>(V1))
       if (Constant *V2C = dyn_cast<Constant>(V2))
         if (Constant *MC = dyn_cast<Constant>(Mask))
@@ -663,7 +956,7 @@ public:
   }
 
   Value *CreateExtractValue(Value *Agg, unsigned Idx,
-                            const char *Name = "") {
+                            const Twine &Name = "") {
     if (Constant *AggC = dyn_cast<Constant>(Agg))
       return Folder.CreateExtractValue(AggC, &Idx, 1);
     return Insert(ExtractValueInst::Create(Agg, Idx), Name);
@@ -673,14 +966,14 @@ public:
   Value *CreateExtractValue(Value *Agg,
                             InputIterator IdxBegin,
                             InputIterator IdxEnd,
-                            const char *Name = "") {
+                            const Twine &Name = "") {
     if (Constant *AggC = dyn_cast<Constant>(Agg))
       return Folder.CreateExtractValue(AggC, IdxBegin, IdxEnd - IdxBegin);
     return Insert(ExtractValueInst::Create(Agg, IdxBegin, IdxEnd), Name);
   }
 
   Value *CreateInsertValue(Value *Agg, Value *Val, unsigned Idx,
-                           const char *Name = "") {
+                           const Twine &Name = "") {
     if (Constant *AggC = dyn_cast<Constant>(Agg))
       if (Constant *ValC = dyn_cast<Constant>(Val))
         return Folder.CreateInsertValue(AggC, ValC, &Idx, 1);
@@ -691,11 +984,10 @@ public:
   Value *CreateInsertValue(Value *Agg, Value *Val,
                            InputIterator IdxBegin,
                            InputIterator IdxEnd,
-                           const char *Name = "") {
+                           const Twine &Name = "") {
     if (Constant *AggC = dyn_cast<Constant>(Agg))
       if (Constant *ValC = dyn_cast<Constant>(Val))
-        return Folder.CreateInsertValue(AggC, ValC,
-                                            IdxBegin, IdxEnd - IdxBegin);
+        return Folder.CreateInsertValue(AggC, ValC, IdxBegin, IdxEnd-IdxBegin);
     return Insert(InsertValueInst::Create(Agg, Val, IdxBegin, IdxEnd), Name);
   }
 
@@ -704,30 +996,32 @@ public:
   //===--------------------------------------------------------------------===//
 
   /// CreateIsNull - Return an i1 value testing if \arg Arg is null.
-  Value *CreateIsNull(Value *Arg, const char *Name = "") {
-    return CreateICmpEQ(Arg, Context.getNullValue(Arg->getType()),
+  Value *CreateIsNull(Value *Arg, const Twine &Name = "") {
+    return CreateICmpEQ(Arg, Constant::getNullValue(Arg->getType()),
                         Name);
   }
 
   /// CreateIsNotNull - Return an i1 value testing if \arg Arg is not null.
-  Value *CreateIsNotNull(Value *Arg, const char *Name = "") {
-    return CreateICmpNE(Arg, Context.getNullValue(Arg->getType()),
+  Value *CreateIsNotNull(Value *Arg, const Twine &Name = "") {
+    return CreateICmpNE(Arg, Constant::getNullValue(Arg->getType()),
                         Name);
   }
 
   /// CreatePtrDiff - Return the i64 difference between two pointer values,
   /// dividing out the size of the pointed-to objects.  This is intended to
-  /// implement C-style pointer subtraction.
-  Value *CreatePtrDiff(Value *LHS, Value *RHS, const char *Name = "") {
+  /// implement C-style pointer subtraction. As such, the pointers must be
+  /// appropriately aligned for their element types and pointing into the
+  /// same object.
+  Value *CreatePtrDiff(Value *LHS, Value *RHS, const Twine &Name = "") {
     assert(LHS->getType() == RHS->getType() &&
            "Pointer subtraction operand types must match!");
     const PointerType *ArgType = cast<PointerType>(LHS->getType());
-    Value *LHS_int = CreatePtrToInt(LHS, Type::Int64Ty);
-    Value *RHS_int = CreatePtrToInt(RHS, Type::Int64Ty);
+    Value *LHS_int = CreatePtrToInt(LHS, Type::getInt64Ty(Context));
+    Value *RHS_int = CreatePtrToInt(RHS, Type::getInt64Ty(Context));
     Value *Difference = CreateSub(LHS_int, RHS_int);
-    return CreateSDiv(Difference,
-                      Context.getConstantExprSizeOf(ArgType->getElementType()),
-                      Name);
+    return CreateExactSDiv(Difference,
+                           ConstantExpr::getSizeOf(ArgType->getElementType()),
+                           Name);
   }
 };