Follow this link for the list of SPIR 1.2 Builtins: https://github.com/KhronosGroup/SPIR-Tools/wiki/SPIR-1.2-built-in-functions
Follow this link for the list of SPIR 2.0 Builtins: https://github.com/KhronosGroup/SPIR-Tools/wiki/SPIR-2.0-built-in-functions