https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62040
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (insn 144 82 145 2 (set (reg:V2DI 33 v1 [orig:96 D.2914 ] [96]) (vec_concat:V2DI (reg:DI 32 v0 [orig:95 D.2915 ] [95]) (vec_duplicate:DI (const_int 0 [0])))) t456.c:76 1030 {move_lo_quad_internal_v2di} (expr_list:REG_DEAD (reg:DI 32 v0 [orig:95 D.2915 ] [95]) (nil))) Is bogus.