Bit slicing is a technique for constructing a processor from modules of processors of smaller bit width, for the purpose of increasing the word length; in theory to make an arbitrary n-bit CPU. Each of these component modules processes one bit field or "slice" of an operand. The grouped processing components would then have the capability to process the chosen full word-length of a particular software design. Bit slicing more or less died out due to the advent of the microprocessor. Recently it has been used in ALUs for quantum computers, and has been used as a software technique
Operational details
Bit slice processors usually include an arithmetic logic unit of 1, 2, 4, 8 or 16 bits and control lines. For example, two 4-bit ALU chips could be arranged side by side, with control lines between them, to form an 8-bit ALU. Four 4-bit ALU chips could be used to build a 16-bit ALU. It would take eight chips to build a 32-bit word ALU. The designer could add as many slices as required to manipulate increasingly longer word lengths. A microsequencer or control ROM would be used to execute logic to provide data and control signals to regulate function of the component ALUs. Known bit-slice microprocessors:
Bit slicing, although not called that at the time, was also used in computers before large scaleintegrated circuits. The first bit-sliced machine was EDSAC 2, built at the University of Cambridge Mathematical Laboratory in 1956–1958. Prior to the mid-1970s and late 1980s there was some debate over how much bus width was necessary in a given computer system to make it function. Silicon chip technology and parts were much more expensive than today. Using multiple, simpler, and thus less expensive ALUs was seen as a way to increase computing power in a cost-effective manner. While 32-bit architecture microprocessors were being discussed at the time, few were in production. The UNIVAC 1100 series mainframes has a 36-bit architecture and the 1100/60 introduced in 1979 used nine Motorola MC10800 4-bit ALU chips to implement the needed word width while using modern integrated circuits. At the time 16-bit processors were common but expensive, and 8-bit processors, such as the Z80, were widely used in the nascent home computer market. Combining components to produce bit slice products allowed engineers and students to create more powerful and complex computers at a more reasonable cost, using off-the-shelf components that could be custom-configured. The complexities of creating a new computer architecture were greatly reduced when the details of the ALU were already specified. The main advantage was that bit slicing made it economically possible in smaller processors to use bipolar transistors, which switch much faster than NMOS or CMOS transistors. This allowed for much higher clock rates, where speed was needed; for example DSP functions or matrix transformation, or as in the Xerox Alto, the combination of flexibility and speed, before discrete CPUs were able to deliver that.
Modern use
Software use on non-bit-slice hardware
In more recent times, the term bit slicing was re-coined by Matthew Kwan to refer to the technique of using a general purpose CPU to implement multiple parallel simple virtual machines using general logic instructions to perform Single Instruction Multiple Data operations. This technique is also known as SIMD Within A Register. This was initially in reference to Eli Biham's 1997 paper A Fast New DES Implementation in Software, which achieved significant gains in performance of DES by using this method.
Bit-sliced quantum computers
To simplify the circuit structure and reduce the hardware cost of quantum computers a 50 GHz superconducting "4-bit bit-slice arithmetic logic unit for 32-bit rapid single-flux-quantum microprocessors was demonstrated."
