llvm dev - Nov 2008 - [LLVMdev] How do I get the result of an instruction?

Hi all,

I probably have a stupid question but I could not find out so please help me out
here. I can use getOperand to get the operands of an instruction. Similarly, How
do I get the result of an instruction?

Thanks,
Bhavani

bhavani krishnan <bhavi63 at yahoo.com> writes:
> I probably have a stupid question but I could not find out so please
> help me out here. I can use getOperand to get the operands of an
> instruction. Similarly, How do I get the result of an instruction?
The result of the instruction is the instruction itself. Whenever you
need to use the result of the instruction, pass the instruction as an
argument.

-- 
Oscar

Thanks!

How do I cast the result to a string? I basically need to store the results of
some instructions in a file.

Thanks,
Bhavani


--- On Sun, 11/16/08, John Criswell <criswell at uiuc.edu> wrote:
> From: John Criswell <criswell at uiuc.edu>
> Subject: Re: [LLVMdev] How do I get the result of an instruction?
> To: "bhavi63 at yahoo.com" <bhavi63 at yahoo.com>,
"LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Date: Sunday, November 16, 2008, 10:55 AM
> bhavani krishnan wrote:
> > Hi all,
> > 
> > I probably have a stupid question but I could not find
> out so please help me out here. I can use getOperand to get
> the operands of an instruction. Similarly, How do I get the
> result of an instruction?   
> The instruction itself is its result.
> 
> For example, if I wanted to generate code that does a
> getlemeneptr instruction (GEP) and then uses the result of
> the GEP as the pointer to a load instruction, I would do the
> following:
> 
> Instruction * GEP = new GetElementPtrInst (Value, ....);
> Instruction * LI = new LoadInst (GEP, "name",
> ...);
> 
> -- John T.
> 
> > Thanks,
> > Bhavani
> > 
> > 
> >       _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >

bhavani krishnan wrote:
> Hi all,
>
> I probably have a stupid question but I could not find out so please help
me out here. I can use getOperand to get the operands of an instruction.
Similarly, How do I get the result of an instruction?
>   
The instruction itself is its result.

For example, if I wanted to generate code that does a getlemeneptr 
instruction (GEP) and then uses the result of the GEP as the pointer to 
a load instruction, I would do the following:

Instruction * GEP = new GetElementPtrInst (Value, ....);
Instruction * LI = new LoadInst (GEP, "name", ...);

-- John T.
> Thanks,
> Bhavani
>
>
>       
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>