https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122066
--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
At the point of the gcc_unreachable, addr looks like
(plus:SI (post_inc:SI (reg:SI 10 %a2 [orig:284 ivtmp.938 ] [284]))
(const_int -8 [0xfffffffffffffff8]))
