Hi,
Thank you for your interest in extending Yeppp!
Bit operations will be supported in Yeppp! one day, but I do not consider them as a high-priority feature. In other words, one shouldn't expect them in the next 6 month.
However, we welcome contributions, and I would help you if you are willing to implement this feature. Adding a new function requires to write default implementation (in C++), documentation for this function, and, setup parameters for unit test, and, optionally, provide optimized implementations in assembly. The code-generator behind Yeppp! will generate all other parts for you: public and private headers, bindings for Fortran, Java, and C#, dispatch tables, unit test source and Nasm/Gas-compatible assembly files. Please contact me privately, and I will explain how to implement new functions to Yeppp! (the build/configuration system is about to the be replaced, and I don't want these instructions to confuse future devs).
Regards,
Marat