if(typeid(*v) == typeid(llvm::Function))
   {
      v->dump();
      return;
    }

    llvm::FunctionType* ft = llvm::FunctionType::get(llvm::Type::getDoubleTy(llvm::getGlobalContext()),
        std::vector<const llvm::Type*>(0,llvm::Type::getDoubleTy(llvm::getGlobalContext())),false);
    llvm::Function* f = llvm::Function::Create(ft,llvm::Function::ExternalLinkage,"",module);
    llvm::BasicBlock* bb = llvm::BasicBlock::Create(llvm::getGlobalContext(),"entry",f);
    builder.SetInsertPoint(bb);
    builder.CreateRet(v);
    std::cerr << "reg dump (before verify):\n";
    v->dump();
    std::cerr << "function dump (before verify):\n";
    f->dump();
    llvm::verifyFunction(*f);
    std::cerr << "verified\n";

    void* fptr = executionEngine->getPointerToFunction(f);
    double (*FP)() = (double (*)())(intptr_t)fptr;
    std::cout << "evaluated to: " << FP() << "\n";