// If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with
// load/store.
ConstantInt *MemOpLength = dyn_cast<ConstantInt>(CI.getOperand(3));
- if (isa<MemCpyInst>(MI))
- if (MemOpLength) {
+ if (MemOpLength) {
unsigned Size = MemOpLength->getZExtValue();
unsigned Align = cast<ConstantInt>(CI.getOperand(4))->getZExtValue();
- const PointerType *PTy = cast<PointerType>(CI.getOperand(1)->getType());
- const Type *MTy = PTy->getElementType();
PointerType *NewPtrTy = NULL;
- if (MTy == Type::Int8Ty) {
- if (Size == 8)
- NewPtrTy = PointerType::get(Type::Int64Ty);
- else if (Size == 4)
- NewPtrTy = PointerType::get(Type::Int32Ty);
- else if (Size == 2)
- NewPtrTy = PointerType::get(Type::Int16Ty);
- else if (Size == 1)
- NewPtrTy = PointerType::get(Type::Int8Ty);
- } else if (MTy == Type::Int16Ty) {
- if (Size == 4)
- NewPtrTy = PointerType::get(Type::Int64Ty);
- else if (Size == 2)
- NewPtrTy = PointerType::get(Type::Int32Ty);
- else if (Size == 1)
- NewPtrTy = PointerType::get(Type::Int16Ty);
- } else if (MTy == Type::Int32Ty) {
- if (Size == 2)
- NewPtrTy = PointerType::get(Type::Int64Ty);
- else if (Size == 1)
- NewPtrTy = PointerType::get(Type::Int32Ty);
- } else if (MTy == Type::Int64Ty) {
- if (Size == 1)
- NewPtrTy = PointerType::get(Type::Int64Ty);
- }
+ // Destination pointer type is always i8 *
+ if (Size == 8)
+ NewPtrTy = PointerType::get(Type::Int64Ty);
+ else if (Size == 4)
+ NewPtrTy = PointerType::get(Type::Int32Ty);
+ else if (Size == 2)
+ NewPtrTy = PointerType::get(Type::Int16Ty);
+ else if (Size == 1)
+ NewPtrTy = PointerType::get(Type::Int8Ty);
if (NewPtrTy) {
- Value *Src =
- InsertCastBefore(Instruction::BitCast,CI.getOperand(2),NewPtrTy,CI);
- Value *Dest =
- InsertCastBefore(Instruction::BitCast,CI.getOperand(1),NewPtrTy,CI);
+ Value *Src = InsertCastBefore(Instruction::BitCast, CI.getOperand(2), NewPtrTy, CI);
+ Value *Dest = InsertCastBefore(Instruction::BitCast, CI.getOperand(1), NewPtrTy, CI);
Value *L = new LoadInst(Src, "tmp", false, Align, &CI);
Value *NS = new StoreInst(L, Dest, false, Align, &CI);
CI.replaceAllUsesWith(NS);