Who can say anything about subroutins (lib): CALLA cc_UC,?C_LMUL CALLA cc_UC,?C_FCAST CALLA cc_UC,?C_FPADD and s.o. Where can I find any information about that?
Thanks
You are not supposed to.
They are internal functions used by the compiler to perform arithmetic with larger integer sizes (or floating point) that the processor doesn't has built-in support for.
This isn't specific for the Keil tools. All compilers makes use of hidden helper functions to some degree.