-
- Constant *Replacement = 0;
- if (getOpcode() == Instruction::GetElementPtr) {
- SmallVector<Constant*, 8> Indices;
- Constant *Pointer = getOperand(0);
- Indices.reserve(getNumOperands()-1);
- if (Pointer == From) Pointer = To;
-
- for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
- Constant *Val = getOperand(i);
- if (Val == From) Val = To;
- Indices.push_back(Val);
- }
- Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
- cast<GEPOperator>(this)->isInBounds());
- } else if (getOpcode() == Instruction::ExtractValue) {
- Constant *Agg = getOperand(0);
- if (Agg == From) Agg = To;
-
- ArrayRef<unsigned> Indices = getIndices();
- Replacement = ConstantExpr::getExtractValue(Agg, Indices);
- } else if (getOpcode() == Instruction::InsertValue) {
- Constant *Agg = getOperand(0);
- Constant *Val = getOperand(1);
- if (Agg == From) Agg = To;
- if (Val == From) Val = To;
-
- ArrayRef<unsigned> Indices = getIndices();
- Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
- } else if (isCast()) {
- assert(getOperand(0) == From && "Cast only has one use!");
- Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
- } else if (getOpcode() == Instruction::Select) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- Constant *C3 = getOperand(2);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- if (C3 == From) C3 = To;
- Replacement = ConstantExpr::getSelect(C1, C2, C3);
- } else if (getOpcode() == Instruction::ExtractElement) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- Replacement = ConstantExpr::getExtractElement(C1, C2);
- } else if (getOpcode() == Instruction::InsertElement) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- Constant *C3 = getOperand(1);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- if (C3 == From) C3 = To;
- Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
- } else if (getOpcode() == Instruction::ShuffleVector) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- Constant *C3 = getOperand(2);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- if (C3 == From) C3 = To;
- Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
- } else if (isCompare()) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- if (getOpcode() == Instruction::ICmp)
- Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
- else {
- assert(getOpcode() == Instruction::FCmp);
- Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
- }
- } else if (getNumOperands() == 2) {
- Constant *C1 = getOperand(0);
- Constant *C2 = getOperand(1);
- if (C1 == From) C1 = To;
- if (C2 == From) C2 = To;
- Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
- } else {
- llvm_unreachable("Unknown ConstantExpr type!");