[Bug tree-optimization/101979] aarch64: wrong code with -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101979

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC is assuming __rt_init_rti_board_end only points to one function pointer
(which is correct based on the C standard).
You need to hide that from GCC to get the code working;
Something like:

    fn_ptr = &__rt_init_rti_board_end;
    fn_ptr_end = &__rt_init_rti_end;
    asm("":"+r"(fn_ptr);
    asm("":"+r"(fn_ptr_end);

    for (; fn_ptr < fn_ptr_end ; fn_ptr ++)
    {
        (*fn_ptr)();
    }