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.