[LLVMdev] access IntegerType::getSignBit from Type *

[mats petersson]

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
   dyn_cast<IntegerType>(pType)->getSignBit()

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) ...

--
Mats

On 22 January 2015 at 10:07, Alexander Poddey <alexander.poddey at gmx.net> wrote:
> Hi,
>
> 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?
>
> Thx
> Alex
>
>
>
> 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);
>
> if(pType.isIntegerTy)
> {
>   pType->getIntegerBitWidth();  // ok
>   pType->HOWTOGET_SIGN_INFO;    //?
> }
>
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