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

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
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What arch btw?

wt., 1.06.2021, 19:16 użytkownik Przemyslaw Ossowski via llvm-dev <
llvm-dev at lists.llvm.org> napisał:
> 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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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