llvm dev - Aug 2011 - [LLVMdev] How to break/iterate over nested instructions.

Dear All,

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

I wish to break this nested instruction in two instructions. Please let me
know if there is already existing method in llvm to do the job.

Thanks,
Manish
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20110826/5095603a/attachment.html>

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

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
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
> _______________________________________________
> 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/20110827/7814380c/attachment.html>