A logic cell for a programmable logic integrated circuit having K function inputs, where K is the largest number such that the logic cell can compute any function of K inputs, and where the logic cell is configurable to implement one bit of a counter in parallel with any independent function of K-1 of the K inputs.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.

A method to add a first one bit variable with a second one bit variable and a carry-in bit, to generate a sum bit and a carry-out bit, the method includes initiating the sum bit to the value of the second one bit variable, initiating the carry-out bit to a value of the carry-in bit and modifying the sum bit and the carry-out bit if a comparison of a sequence of the first one bit variable, the second one bit variable and an inverse value of the carry-in bit matches one of a predefined set of a change trigger sequences.

A processing unit includes a plurality of adders and a plurality of carry bit generation circuits. The plurality of adders add first and second X bit binary portion values of a first Y bit binary value and a second Y bit binary value. Y is a multiple of X. The plurality of adders further generate first carry bits. The plurality of carry bit generation circuits is coupled to the plurality of adders, respectively, and receive the first carry bits. The plurality of carry bit generation circuits generate second carry bits based on the first carry bits. The plurality of adders use the second carry bits to add the first and second X bit binary portions of the first and second Y bit binary values, respectively.

A processing unit includes a plurality of adders and a plurality of carry bit generation circuits. The plurality of adders add first and second X bit binary portion values of a first Y bit binary value and a second Y bit binary value. Y is a multiple of X. The plurality of adders further generate first carry bits. The plurality of carry bit generation circuits is coupled to the plurality of adders, respectively, and receive the first carry bits. The plurality of carry bit generation circuits generate second carry bits based on the first carry bits. The plurality of adders use the second carry bits to add the first and second X bit binary portions of the first and second Y bit binary values, respectively.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.

An arithmetic logic unit is disclosed that includes a first logical circuit that generates a first partial sum result from three operands in a first stage of a single clock cycle of a processor; a second circuit that generates a second partial result in the same first stage of the clock cycle of the processor; and an adder that receives the first partial result from the first logical circuit and the second partial result from the second circuit and generates a secondary result during a second stage of the single clock cycle of the processor. The arithmetic logic unit may optionally further include a backend circuit that performs additional arithmetic and logic functions in the same single clock cycle of the processor.