The site says:
> All other things being equal, assume GCC/LLVM x86/x64 implementation-defined behaviors.
> All other things being equal, assume GCC/LLVM x86/x64 implementation-defined behaviors.
* windows - https://godbolt.org/z/WWWzarEsK
* linux - https://godbolt.org/z/57WK45o6e
same for gcc on linux/windows (mingw)