You can inspect or modify library functions by examining the source code in the lib/src subdirectory of the compiler installation. For example, C:\ti\ccsv7\tools\compiler\pru_#.#.#\lib\src.
One you have located the relevant source code, change the specific function file and rebuild the library.
You can use this source tree to rebuild the rtspruv3_le.lib library or to build a new library. See Section 7.4 for details on building.