https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49330
--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> --- IMHO as RTL drops the difference between pointers and integers (of the same mode) it has to drop the assumption that pointer arithmetic has to stay inside a pointed-to object similar to how it has to drop reliance on undefined overflow for optimization since it drops the notion of signedness. The other choice may seem to take REG_POINTER setting conservative and only have the assumption on REG_POINTER regs. (and thus make sure to set REG_POINTER and MEM_POINTER conservatively, which may be a difficult task on its own)
