svp64 cannot (well it could) extend to 96 bit ops. twin v3.1 ops allow full 64 bit immediates to be constructed. a pair of 32-bit immediates. first is hi-half, second is lo-half. neither of which are (sanely) accessible by svp64. ORing does not work (well/easily) with fp numbers due to the use of FP64 even for single. l.