llvm dev - Nov 2016 - LLVM IR: 'class llvm::Instruction' has no member named 'getAddressSpace'

I have following LLVM IR instruction:

%ptrA = getelementptr float, float addrspace(1)* %A, i32 %id

To get the addrspace value, do I use function call getAddressSpace() or
getPointerAddressSpace() ?

Using getAddressSpace() results in following error:

'class llvm::Instruction' has no member named 'getAddressSpace'

But I see these methods in Instruction.h implemented for getelementptr inst
class.

Thank you.

Regards,

Gurunath

P.S.: is this the right forum to ask such questions? I see very high-level
discussions going on here. If this is not the right forum then please guide
me to the appropriate one. Otherwise thanks.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20161128/96d21188/attachment.html>

> On Nov 28, 2016, at 1:31 PM, Gurunath Kadam via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> I have following LLVM IR instruction:
> 
> %ptrA = getelementptr float, float addrspace(1)* %A, i32 %id
> 
> To get the addrspace value, do I use function call getAddressSpace() or
getPointerAddressSpace() ?
> 
> Using getAddressSpace() results in following error:
> 
> 'class llvm::Instruction' has no member named
'getAddressSpace'
> 
> But I see these methods in Instruction.h implemented for getelementptr inst
class.
> 
> 
You need to cast the instruction to the right subclass before being able to call
the method that are implemented for the particular subclass.

If you have an “Instruction *” you can only call on it methods that defined in
the class Instruction. (Note that this is not LLVM specific, this is generic
C++).

LLVM has its own RTTI implementation, when you have an instruction and you don’t
know if it is a particular subclass, you can “try” to cast it to the type you
want:

if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(I)) {
   … // use GEP
}


— 
Mehdi

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20161128/b6567f2d/attachment.html>

> On Nov 28, 2016, at 1:31 PM, Gurunath Kadam via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> I have following LLVM IR instruction:
> 
> %ptrA = getelementptr float, float addrspace(1)* %A, i32 %id
> 
> To get the addrspace value, do I use function call getAddressSpace() or
getPointerAddressSpace() ?
> 
> Using getAddressSpace() results in following error:
> 
> 'class llvm::Instruction' has no member named
'getAddressSpace'
> 
> But I see these methods in Instruction.h implemented for getelementptr inst
class.
GetElementPtrInst subclasses Instruction, so you need a cast. E.g:

  if (auto *GEP = dyn_cast<llvm::GetElementPtrInst>(I))
    return GEP->getAddressSpace();

> P.S.: is this the right forum to ask such questions? I see very high-level
discussions going on here. If this is not the right forum then please guide me
to the appropriate one. Otherwise thanks.
llvm-dev is fine.

best,
vedant