No, even type-punning properly allocated memory (e.g. using memory to reinterpret the bits of a floating point number as an integer) through pointers is UB because compilers want to use types for alias analysis[1]. In order to do that "properly" you are supposed to use a union. In C++ you are supposed to use the reinterpret_cast operator.

[1] Which IMO goes back to C's original confusion of mixing up machine-level concepts with language-level concepts from the get-go, leaving optimizers no choice but unsound reasoning and blaming programmers when they get it wrong. Something something numerical loops and supercomputers.