[LLVMdev] Grabbing Result of an Instruction.

[Manish Gupta]

Thanks!!!  James and Michael. yes now got the idea how it is working.

Manish

On Tue, Aug 2, 2011 at 7:59 AM, James Molloy <james.molloy at arm.com> wrote:

> 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****
>
> > _______________________________________________
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> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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> >
> >****
>
> ** **
>
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