6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-15 07:34:33 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
Do not filter memmove.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42930 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-10-12 20:10:21 +00:00
parent fff760296f
commit 7b9e1d251f
1 changed files with 12 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -7669,43 +7669,22 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with // If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with
// load/store. // load/store.
ConstantInt *MemOpLength = dyn_cast<ConstantInt>(CI.getOperand(3)); ConstantInt *MemOpLength = dyn_cast<ConstantInt>(CI.getOperand(3));
if (isa<MemCpyInst>(MI)) if (MemOpLength) {
if (MemOpLength) {
unsigned Size = MemOpLength->getZExtValue(); unsigned Size = MemOpLength->getZExtValue();
unsigned Align = cast<ConstantInt>(CI.getOperand(4))->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; PointerType *NewPtrTy = NULL;
if (MTy == Type::Int8Ty) { // Destination pointer type is always i8 *
if (Size == 8) if (Size == 8)
NewPtrTy = PointerType::get(Type::Int64Ty); NewPtrTy = PointerType::get(Type::Int64Ty);
else if (Size == 4) else if (Size == 4)
NewPtrTy = PointerType::get(Type::Int32Ty); NewPtrTy = PointerType::get(Type::Int32Ty);
else if (Size == 2) else if (Size == 2)
NewPtrTy = PointerType::get(Type::Int16Ty); NewPtrTy = PointerType::get(Type::Int16Ty);
else if (Size == 1) else if (Size == 1)
NewPtrTy = PointerType::get(Type::Int8Ty); 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);
}
if (NewPtrTy) { if (NewPtrTy) {
Value *Src = Value *Src = InsertCastBefore(Instruction::BitCast, CI.getOperand(2), NewPtrTy, CI);
InsertCastBefore(Instruction::BitCast,CI.getOperand(2),NewPtrTy,CI); Value *Dest = InsertCastBefore(Instruction::BitCast, CI.getOperand(1), NewPtrTy, CI);
Value *Dest =
InsertCastBefore(Instruction::BitCast,CI.getOperand(1),NewPtrTy,CI);
Value *L = new LoadInst(Src, "tmp", false, Align, &CI); Value *L = new LoadInst(Src, "tmp", false, Align, &CI);
Value *NS = new StoreInst(L, Dest, false, Align, &CI); Value *NS = new StoreInst(L, Dest, false, Align, &CI);
CI.replaceAllUsesWith(NS); CI.replaceAllUsesWith(NS);