[llvm-dev] Adding instructions in pass directly from string containing IR

[Johannes Doerfert via llvm-dev]

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
>
>
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