Worked on the espressif/llvm-project repository to enhance the stability of the SLPVectorizer component by addressing a potential underflow issue in ReduxWidth calculations. Applied defensive programming techniques in C++ to introduce a guard ensuring ReduxWidth remains greater than zero before performing subtraction, directly responding to static analysis findings. This change improved the robustness of the vectorization pass and reduced the risk of incorrect optimizations or downstream code generation issues. The solution was validated through existing tests and static analysis, aligning with established compiler development practices and ensuring no regressions were introduced, thereby contributing to the overall reliability of the codebase.