[Bug middle-end/98503] [11/12 regression] -Warray-bounds false positive with global variables at -O2 since r11-3306-g3f9a497d1b0dd9da

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98503

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
So at the point we diagnose we see the following IL for cont_dump:

<bb 2> [local count: 1073741824]:
__mptr_5 = MEM[(struct ref *)&head].list.n;
goto <bb 8>; [100.00%]

that's because the testcase has static 'last_dumped' which means it is NULL
and we start restart_dump with

        if (!last)
            last = get_initial_step();

which does

static inline struct ref *get_initial_step()
{
    return container_of(&head, struct ref, list);
}

that means next_step will do the bad access of 'head' using the struct ref
type.