When was the last time you checked that msvc and icc always use a function call form memcpy? At least the latest versions of msvc and icc can replace memcpy with appropriate move instruction. You can see here https://godbolt.org/z/BX0Wya that msvc 2017, msvc 2015, icc 18.0 and even icc 13.0.1 used a mov instruction for memcpy to uint32 instead of function call.