[LLVMdev] insert nop instruction

[Zahra Marj]

My pass runs after optimization passes.

On Thu, Jul 9, 2015 at 1:11 PM, David Chisnall <David.Chisnall at cl.cam.ac.uk>
wrote:

> Hi,
>
> What are you trying to achieve?  Inserting NOPs into LLVM IR is likely to
> be pointless, as optimisations (in the IR or SelectionDAG) will remove them
> before machine code generation.  If you want to insert NOPs into the
> generated machine code, then this will not help you (you could insert
> inline assembly containing nops into the IR).
>
> David
>
> > On 9 Jul 2015, at 09:25, Zahra Marj <zahrafatehimarj at gmail.com> wrote:
> >
> > Hi.
> > I need to write a function pass that insert nop instruction in function.
> Examples of these instructions are: %nop = add i1 0, 0 or %nop = alloca i1,
> i1 0. This link couldn't help me:
> http://llvm.org/docs/ProgrammersManual.html#creating-and-inserting-new-instructions
> > I need a clear example about inserting new instruction. Anyone can help
> me?
> > Thanks.
> > _______________________________________________
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> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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