128-bit

While there are currently no mainstream general-purpose processors built to operate on 128-bit integers or addresses, a number of processors do have specialized ways to operate on 128-bit chunks of data. The IBM System/370 could be considered the first rudimentary 128-bit computer, as it used 128-bit floating point registers. Most modern CPUs feature SIMD instruction sets where 128-bit vector registers are used to store several smaller numbers, such as four 32-bit floating-point numbers.