void svstnt1_vnum[_f64](svbool_t pg, float64_t *base, int64_t vnum, svfloat64_t data)
void svstnt1_vnum[_s64](svbool_t pg, int64_t *base, int64_t vnum, svint64_t data)
void svstnt1_vnum[_u64](svbool_t pg, uint64_t *base, int64_t vnum, svuint64_t data)