llvm dev - Jun 2021 - Adding instructions in pass directly from string containing IR

Hi Przemek,

I doubt that such functionality exists right now. The main
problem I see is the name matching to embed it with other code.
If the new code is not connected, I'd recommend the pass to
read in an IR file with a function in it, link it into the module,
and insert a call wherever you want to "paste" the instructions.

Much cleaner than dealing with strings, IMHO.

~ Johannes


On 6/1/21 12:16 PM, Przemyslaw Ossowski via llvm-dev
wrote:
> Hello,
>
>
>
> I would like to add a pass which modifies IR by insertion set of IR
> instructions somewhere in the middle of the basicblock,
>
> like example below:
>
>
>
>    %address = call i32* @llvm.target_intrinsic.getaddress()
>
>    %value = load i32, i32* %address
>
>    %addvalue = add nsw i32 %value, 10
>
>    store i32 %addvalue, i32* %address
>
>
>
> Is there any function available which would allow for parsing the string
> (containing set of instructions) and generating instructions automatically
> instead of manually calling functions creating instructions from IRBuilder?
>
> ...at least for simple set of basic instructions
>
>
> Regards,
>
> Przemek
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Thank you Johannes for your suggestion.

In case a call to the function which would contain the code I would like to
paste is inserted into another function, then is it still possible to
simply inline the code?
I would like to avoid calling the function with the "pasted" code. I
assume
there is a pass which inlines functions which should be executed later.

Thanks,
Przemek


On Wed, Jun 2, 2021 at 4:13 AM Johannes Doerfert <johannesdoerfert at
gmail.com>
wrote:
> Hi Przemek,
>
> I doubt that such functionality exists right now. The main
> problem I see is the name matching to embed it with other code.
> If the new code is not connected, I'd recommend the pass to
> read in an IR file with a function in it, link it into the module,
> and insert a call wherever you want to "paste" the instructions.
>
> Much cleaner than dealing with strings, IMHO.
>
> ~ Johannes
>
>
> On 6/1/21 12:16 PM, Przemyslaw Ossowski via llvm-dev wrote:
> > Hello,
> >
> >
> >
> > I would like to add a pass which modifies IR by insertion set of IR
> > instructions somewhere in the middle of the basicblock,
> >
> > like example below:
> >
> >
> >
> >    %address = call i32* @llvm.target_intrinsic.getaddress()
> >
> >    %value = load i32, i32* %address
> >
> >    %addvalue = add nsw i32 %value, 10
> >
> >    store i32 %addvalue, i32* %address
> >
> >
> >
> > Is there any function available which would allow for parsing the
string
> > (containing set of instructions) and generating instructions
> automatically
> > instead of manually calling functions creating instructions from
> IRBuilder?
> >
> > ...at least for simple set of basic instructions
> >
> >
> > Regards,
> >
> > Przemek
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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