Developed Xuantie CPU support for the rust-lang/gcc repository, expanding GCC’s backend to target the xt-c908, xt-c910, and xt-c920 RISC-V CPU families. This work involved creating new RISC-V core definitions, adding tuning data, and implementing -mcpu targeting support, all in C. The developer also automated validation tests to ensure correct -mcpu usage and updated documentation to guide users on the new CPU targets. By enabling optimized code generation for Xuantie processors, this contribution facilitates broader adoption of GCC in embedded systems. The work demonstrated skills in compiler development, embedded systems, and RISC-V architecture, with a focus on backend integration.