https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65752
--- Comment #26 from Chung-Kil Hur <gil.hur at sf dot snu.ac.kr> --- Thanks for the detailed explanations. > The C standard only guarantees that you can convert a pointer to uintptr_t > and back, it doesn't guarantee that you can convert a modified uintptr_t > back to > a pointer that is valid. > > Thus, doing (int *)((xp + i) - j) is invoking undefined behavior. > I didn't know about this rule. I thought this cast is valid because "(xp+i)-j" is even "safely-derived". Could you give a reference for that rule in the standard? Thanks!
