[llvm] r189000 - Add a new helper method to Value to strip in-bounds constant offsets of

[Duncan Sands]

>> --- llvm/trunk/lib/IR/Value.cpp (original)
>> +++ llvm/trunk/lib/IR/Value.cpp Thu Aug 22 06:25:11 2013
>> @@ -393,6 +393,40 @@ Value *Value::stripInBoundsConstantOffse
>>     return stripPointerCastsAndOffsets<PSK_InBoundsConstantIndices>(this);
>>   }
>>
>> +Value *Value::stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
>> +                                                        APInt &Offset) {
>> +  if (!getType()->isPointerTy())
>> +    return this;
>> +
>> +  assert(Offset.getBitWidth() == DL.getPointerSizeInBits(cast<PointerType>(
>> +                                     getType())->getAddressSpace()) &&
>> +         "The offset must have exactly as many bits as our pointer.");
>
> Is there really no neater way of getting the pointer size in bits?  If not,
> maybe add a helper for that?

For example, you could just use DL's getTypeSizeInBits, or
getPointerTypeSizeInBits which just calls getTypeSizeInBits
after doing some sanity checking.

Ciao, Duncan.