Worked on the espressif/llvm-project repository to address a critical bug affecting thread-local storage on AMDGPU targets. Focused on compiler development using C++ and LLVM, the work involved recovering a deleted AddrSpaceCast in ItaniumCXXABI.cpp to ensure correct address space handling for thread-local variables. To validate the solution and prevent future regressions, a dedicated regression test, amdgpu_threadprivate.cpp, was added. This fix improved the correctness and stability of thread-local storage handling in AMDGPU builds, reducing related bugs for downstream projects. The approach demonstrated expertise in code generation, address space casting, and regression testing within the LLVM and Clang toolchain.