[LLVMdev] How to break/iterate over nested instructions.

[Manish Gupta]

Hi Duncan,

Why to break?
I wish to analyse all the operands of getelemetptr instructions. For which I
iterate over the code and get the instruction of interest by
getopcode == getelementptr. But the getelementptrs in this form as in my
last mail are getting away from my pass. So i wish to break it. I have a
work around if breaking is not possible, but I think it may be a common
requirement by other passes too.

Thanks!
Manish

On Sat, Aug 27, 2011 at 12:41 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi Manish,
>
> > I wish to iterate over all instructions (where opCode == desired_opCode).
> I
> > could iterate over all the instruction expect the nested instructions
> like:
> >
> >   %add.ptr229 = getelementptr inbounds i8* getelementptr inbounds ([4096
> x i8]*
> > @_Func1, i32 0, i32 0), i64 %idx.ext228
>
> this is not a nested instruction.  The inner getelementptr is a
> ConstantExpr
> (a constant) not an instruction.
>
> > I wish to break this nested instruction in two instructions.
>
> Why?
>
> Ciao, Duncan.
>
>  Please let me know
> > if there is already existing method in llvm to do the job.
> >
> > Thanks,
> > Manish
> >
> >
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