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Dest type is always i8 *. This allows some simplification.

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Do not filter memmove.

llvm-svn: 42930
This commit is contained in:
Devang Patel 2007-10-12 20:10:21 +00:00
parent acf0aac0c1
commit f65c028dad
1 changed files with 12 additions and 33 deletions
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45
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -7669,43 +7669,22 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// 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);