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Support changing the pointer type of a store for the case where we are
storing into the first element of the structure type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1832 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -721,6 +721,18 @@ static bool OperandConvertableToType(User *U, Value *V, const Type *Ty,
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const Type *ElTy = PT->getElementType();
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assert(V == I->getOperand(1));
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if (isa<StructType>(ElTy)) {
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// We can change the destination pointer if we can store our first
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// argument into the first element of the structure...
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//
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unsigned Offset = 0;
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std::vector<Value*> Indices;
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ElTy = getStructOffsetType(ElTy, Offset, Indices, false);
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assert(Offset == 0 && "Offset changed!");
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if (ElTy == 0) // Element at offset zero in struct doesn't exist!
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return false; // Can only happen for {}*
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}
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// Must move the same amount of data...
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if (TD.getTypeSize(ElTy) != TD.getTypeSize(I->getOperand(0)->getType()))
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return false;
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@ -959,13 +971,14 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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} else { // Replace the source pointer
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const Type *ValTy = cast<PointerType>(NewTy)->getElementType();
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std::vector<Value*> Indices;
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#if 0
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Indices.push_back(ConstantUInt::get(Type::UIntTy, 0));
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while (ArrayType *AT = dyn_cast<ArrayType>(ValTy)) {
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if (isa<StructType>(ValTy)) {
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unsigned Offset = 0;
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Indices.push_back(ConstantUInt::get(Type::UIntTy, 0));
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ValTy = AT->getElementType();
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ValTy = getStructOffsetType(ValTy, Offset, Indices, false);
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assert(Offset == 0 && ValTy);
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}
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#endif
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Res = new StoreInst(Constant::getNullConstant(ValTy), NewVal, Indices);
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VMC.ExprMap[I] = Res;
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Res->setOperand(0, ConvertExpressionToType(I->getOperand(0), ValTy, VMC));
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