Contributed to the espressif/llvm-project by implementing HLSL WaveActive intrinsics, specifically WaveActiveSum and WaveActiveMax, with cross-backend support for SPIR-V and DXIL. This work involved developing code generation and semantic analysis in C++ and LLVM IR, along with comprehensive end-to-end tests to ensure correct lowering across multiple targets. Additionally, addressed CI reliability by stabilizing the SPIR-V test environment on Ubuntu 22.04, resolving failures caused by missing Python dependencies. The contributions enhanced shader compute performance, improved cross-backend feature parity, and reduced release risk for downstream toolchains, demonstrating depth in compiler development, CI/CD workflows, and low-level optimization.