https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79251
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> --- Perhaps something like: (copy word 1 in vB to word rB in vT; BE) sldi rB,rB,2 lvsl vP,0,rB vperm vT,vT,vT,vP xxinsertw vT,vB,0 lvsr vP,0,rB vperm vT,vT,vT,vP (i.e. rotate the dest vector so that the dest elt becomes elt 0, do the insert, rotate back).
