auto llval = b.getInt32(-1);
std::cout << llval->getZExtValue() << "
"; // 无符号
std::cout << llval->getSExtValue() << "
"; // 有符号
ConstantFP* llval = ConstantFP::get(*ctx, APFloat(1.2));
std::cout << llval->getValueAPF().convertToDouble() << "
";
ConstantFP* llval = ConstantFP::get(*ctx, APFloat((float)1.2));
std::cout << llval->getValueAPF().convertToFloat() << "
";