https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79990
--- Comment #1 from Alexander Ivchenko <aivchenk at gmail dot com> --- The problem here is that chkp creates bounds for register variable: vsdump.c.025t.chkp: Building bounds for address of decl u Made bounds: __bound_tmp.0_4 = __builtin_ia32_bndmk (&u, 16); And when we expanding &u we face expand_expr_addr_expr_1: /* If the DECL isn't in memory, then the DECL wasn't properly marked TREE_ADDRESSABLE, which will be either a front-end or a tree optimizer bug. */ gcc_assert (MEM_P (result)); where "result" is: (reg/v:V4SI 21 xmm0 [ u ]) We need to disable the instrumentation of register variables and the subscriptions of those variables. I couldn't find the correct place for that disabling so far though.