128-bit vectors can do some stuff with integers, but most don't work at all for 128-bit floats which are where 128-bit is most important in hardware (because th

128-bit vectors can do some stuff with integers, but most don't work at all for 128-bit floats which are where 128-bit is most important in hardware (because the software fallback is SLOW). I believe IBM POWER chips have both IEEE 128 floats (I think they call them a long double) and IEEE 128-bit decimal too. Outside of some very precise simulations though, I doubt there is very much demand.