https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114843
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
((insn 262 261 263 14 (parallel [
(set (reg:DI 0 x0)
(unspec:DI [
(mem/c:V2x8QI (plus:DI (reg/f:DI 31 sp)
(const_int 16 [0x10])) [0 S16 A8])
] UNSPEC_LDP_FST))
(set (reg:DI 1 x1)
(unspec:DI [
(mem/c:V2x8QI (plus:DI (reg/f:DI 31 sp)
(const_int 16 [0x10])) [0 S16 A8])
] UNSPEC_LDP_SND))
]) "../../../libgcc/unwind.inc":141:1 -1
(nil))
It is added by pro_and_epilogue for some reason ...