https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64688
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is while reloading
(define_insn "vec_set<mode>_0"
[(set (match_operand:VI4F_128 0 "nonimmediate_operand"
"=Yr,*v,v,v ,x,x,v,Yr ,*x ,x ,m ,m ,m")
(vec_merge:VI4F_128
(vec_duplicate:VI4F_128
(match_operand:<ssescalarmode> 2 "general_operand"
" Yr,*v,m,*r,m,x,v,*rm,*rm,*rm,!x,!*re,!*fF"))
(match_operand:VI4F_128 1 "vector_move_operand"
" C , C,C,C ,C,0,v,0 ,0 ,x ,0 ,0 ,0")
(const_int 1)))]
instruction I think.