access IntegerType::getSignBit from Type *


I have a Type * which may come from an IntegerType as shown below:

Type.getIntegerBitWidth() tells me numBits.
But how to extract the IntegerType.getSignBit?

If pType isIntegerType, I need to know if it is signed or unsigned...

How to achieve this?


llvm::Type * getRandomValid_IntegerType(llvm::LLVMContext &C)
    using namespace llvm;

    //--- determine num of bits between allowed bits
    int rI=randInt(IntegerType::MIN_INT_BITS,IntegerType::MAX_INT_BITS);

    return IntegerType::get(C, rI);


llvm::Type * pType=getRandomValid_IntegerType(llvm::LLVMContext &C);

  pType->getIntegerBitWidth(); // ok

You will need to do soemthing like:

     IntegerType* pInt = dyn_cast<IntegerType>(pType);
     if (pInt) ... use pInt->getSignBit() ...

Of course, you have already checked isIntegerTy, so it's probably fine
to not check if the conversion was good. So you could do

But if you are going to dyn_cast, you could as well do :
   if (IntegerType* pInt = dyn_cast<IntegerType>(pType))

instead of if (pType.isIntegerTy) ...

Hi mats,

:smiting my forehead: Sure! thats it, thanks a lot.


mats petersson wrote: