Add an llvm instruction

I'm new to LLVM and I was wondering if you could help me building a pass to duplicate instructions in LLVM IR, the problem I'm facing is that the cloned instructions couldn't be returned using (user class), is this the correct way to do it ? are there any other ways (excluding this http://ift.tt/1o922hO) My pass:

BasicBlock *B = I->getParent();
if (auto *op = dyn_cast<BinaryOperator>(&*I)) 
{
    auto temp = op->clone();
    B->getInstList().insert(op, temp);
    temp->setName(op->getName());

    if (temp->getOpcode() == Instruction::Add)
    {

        IRBuilder<> builder(temp); //building the cloned instruction 
        Value *lhs = temp->getOperand(0);
        Value *rhs = temp->getOperand(1);
        Value *add1 = builder.CreateAdd(lhs, rhs);
        for (auto &v : temp->uses()) {
            User *user = v.getUser();  // A User is anything with operands.
            user->setOperand(v.getOperandNo(), add1);     
        }
    }
}