[LLVMdev] access IntegerType::getSignBit from Type *

[Alexander Poddey]

Hi mats,

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

Alex


mats petersson wrote:

> 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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