[Question] Are bit shift functions available in structured text?

[Servostar]

While experimenting with ruSTy on some implementations for PRNGs, I came across this:

Seemingly, ruSTy does not support bitwise function defined in IEC 61131-3 (6.6.2.5.10). Am I mistaken about that?
What would be the best way to implement this? Perhaps an external library implementing these functions in C which is then added during link time. However, this would add an unnecessary function call.
Is there a way to have ruSTy/LLVM generate platform native bitshift functions?

[ghaith]

Hello @Servostar,

I converted the issue to a question/discussion as it better fits in the discussion board.

All standard functions are implemented in the standard functions library (with some exceptions that are directly built-in) the bitshift are defined in the bit_shift_functions.st file in the standard library.
You can compile the library by using ./scripts/build.sh --build --release --package which will compile the library into the output folder.
To use it you can either add the standard library to your plc.json or link with the standard library using the command line interface by including the appropriate header with -i output/includes/bit_shift_functions.st and adding the library with -liec61131std. You need the output directory container the .so file to be in your linker search path, you can do this with export LD_LIBRARY_PATH=output/lib assuming the so file is in the lib folder.

note if you don't want to compile the library it's always packaged in the github action: https://github.com/PLC-lang/rusty/actions/runs/16051881377 as stdlib