[LLVMdev] Extract operations as function

[Manish Gupta]

Great!! Thanks Duncan.
By step 1 that you mentioned it seems I can write my function func(x,y,op)
in mypass.cpp itself. Please elaborate how can add it to the module?


On Thu, May 12, 2011 at 1:22 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi Manish,
>
> > I am planning to extract every operation as function.
> >
> > eg. z=x+y; ==> z=func(x,y,op);
> >
> > I wish to write a custom definition of op. Which I would like to define
> in func.
> >
> > It would be really helpful if someone could suggest passes already
> available in
> > llvm to look for or point some references how should one proceed on it.
>
> I think you should write your own pass that
> (1) adds a declaration of "func" to the module
> (2) iterates over all functions, and all instructions in the function.
>  When it
> sees a binary operator ("isa<BinaryOperator>(Instruction)") it needs to
> first
> insert a call just in front of the instruction (see an IRBuilder to do
> this;
> use "SetInsertPoint(Instruction)" to tell it where to add the call; use
> CreateCall3 to create the call).  Then use replaceAllUsesWith to replace
> every
> use of the binary operator with the call you just created.  Finally, delete
> the
> original instruction (eraseFromParent).
>
> Ciao, Duncan.
>
> >
> > Is codeExtractor.cpp useful for this. I was also thinking of going like
> > loop-extract way. any other suggestion would be extremely helpful
> >
> >
> >
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