[LLVMdev] Grabbing Result of an Instruction.

[James Molloy]

Hi Manish,

 

As Michael mentioned, the Instruction is its own result.

 

The Instruction class subclasses Value. If you treat the Instruction as a
Value you will get what you want - just call I->getType() to get the type of
the instruction.

 

James

 

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Manish Gupta
Sent: 02 August 2011 15:43
To: Michael Ilseman; llvmdev
Subject: Re: [LLVMdev] Grabbing Result of an Instruction.

 

Thanks Michael.

I wish to get Type of %1 i.e. result of instruction. Let me try out your
suggestion. But It is still not clear to me how will dyn_cast will help
here. I already have pointer to this particular instruction. 

 

On Mon, Aug 1, 2011 at 5:34 PM, Michael Ilseman <michael at lunarg.com> wrote:

In LLVM, %1 is the instruction itself. This is because LLVM IR is in
SSA, so the "=" really means equality. If you look at a use of %1,
e.g. as an operand to another instruction, you'll see that it's the
instruction itself that is there (i.e. you can dyn_cast<Instruction>
it).


On Mon, Aug 1, 2011 at 5:27 PM, Manish Gupta <manishg at cs.ucsd.edu> wrote:
> What member function to use if I wish to operate on results of an
> instruction.
> eg.
> Instruction  %1 = getelementptr inbounds [10 x i32]* %a, i32 0, i32 %0
> I->getOperand will give me the operands.
> How should I get hold of %1?
> Thanks,
> Manish

> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>

 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20110802/a23e5e53/attachment.html>