摘要:
A binary logic unit to apply any Boolean operation on two input signals (va, vb) is described, wherein any Boolean operation to be applied on the input signals (va, vb) is defined by a particular combination of well defined control signals (ctl0, ctl1, ctl2, ctl3), wherein the input signals (va, vb) are used to select a control signal (ctl0, ctl1, ctl2, ctl3) as an output signal (vo) of the binary logic unit representing the result of a particular Boolean operation applied on the two input signals (va, vb). Furthermore a method to operate such a binary logic unit is described.
摘要翻译:描述了用于对两个输入信号(v SUB,a,B)进行任何布尔运算的二进制逻辑单元,其中应用于输入信号的任何布尔运算(v 由定义良好的控制信号(ct10,ct11,ct12,ct13)的特定组合定义,其中输入信号(v 用于选择作为输出信号的控制信号(ct1 0,ct1,ctl2,ct13)作为输出信号(v < / SUB>)表示施加在两个输入信号(v SUB a,v B b)上的特定布尔运算的结果的二进制逻辑单元。 此外,描述了操作这种二进制逻辑单元的方法。
摘要:
A method for operand width reduction is described, wherein two N-bit input operands (A, B) of a bit width of N are processed and two M-bit output operands (A′, B′) of a reduced bit width of M are generated in a way, that a post-processing comprising an M-bit adder function followed by saturation to M bits performed on said two M-bit output operands (A′, B′) provides an M-bit result equal to an M-bit result of an N-bit modulo adder function of the two N-bit input operands (A, B), followed by a saturation to M bits. Further an electronic computing circuit (1, 5) is described performing said method. Additionally a computer system comprising such an electronic computing circuit is described.
摘要:
A system and a method for storing numbers in a register file are provided. The system and the method store single precision numbers in double precision format in a register file that is shared between floating point computational units and computational units not supporting floating point numbers.
摘要:
A 3-stack floorplan for a floating point unit includes: an aligner located in the center of the floating point unit; a frontend located directly above the aligner; a multiplier located directly below the frontend and next to the aligner; an adder located directly next to the multiplier and directly below the aligner; a normalizer located directly above the adder; and a rounder located directly above the normalizer.
摘要:
A method for executing multiple computational primitives is provided in accordance with exemplary embodiments. A first computational unit and at least a second computational unit cooperate to execute multiple computational primitives. The first computational unit independently computes other computational primitives. By virtue of arbitration for shared source operand buses or shared result buses, availability of the first and second computational units needed to execute cooperatively the multiple computational primitives is assured by a process of reservation as used for a computational primitive executed on a dedicated computational unit.
摘要:
A method for implementing sign extension within a multi-precision multiplier is described. The method includes receiving a first input within a multiplier core of the multiplier, receiving a second input within the multiplier core, and creating partial products in the multiplier core using the first and second inputs. The method also includes summing up the partial products in a partial product reduction tree in the multiplier core. The method also includes performing sign extension within the partial product reduction tree of the multiplier core by adding a value to a partial product of the partial product reduction tree. The method further includes computing an output from the partial product reduction tree, the output including a final product of the first and second inputs signed extended to a desired width.
摘要:
A distributed residue checking apparatus for a floating point unit having a plurality of functional elements performing floating-point operations on a plurality of operands. The distributed residue checking apparatus includes a plurality of residue generators which generate residue values for the operands and the functional elements, and a plurality of residue checking units distributed throughout the floating point unit. Each residue checking unit receives a first residue value and a second residue value from respective residue generators and compares the first residue value to the second residue value to determine whether an error has occurred in a floating-point operation performed by a respective functional element.
摘要:
The forcing of the result or output of a rounder portion of a floating point processor occurs only in a fraction non-increment data path within the rounder and not in the fraction increment data path within the rounder. The fraction forcing is active on a corner case such as a disabled overflow exception. A disabled overflow exception may be detected by inspecting the normalized exponent. If a disabled overflow exception is detected, the round mode is selected to execute only in the non-increment data path thereby preventing the fraction increment data path from being selected.
摘要:
A floating point processor unit includes a shift amount calculation circuit within a normalizer portion of the floating point unit, wherein the shift amount calculation circuit is utilized to compute the normalizer shift amount for a log estimate instruction that runs as a pipelinable instruction.
摘要:
A method for converting a signed fixed point number into a floating point number that includes reading an input number corresponding to a signed fixed point number to be converted, determining whether the input number is less than zero, setting a sign bit based upon whether the input number is less than zero or greater than or equal to zero, computing a first intermediate result by exclusive-ORing the input number with the sign bit, computing leading zeros of the first intermediate result, padding the first intermediate result based upon the sign bit, computing a second intermediate result by shifting the padded first intermediate result to the left by the leading zeros, computing an exponent portion and a fraction portion, conditionally incrementing the fraction portion based on the sign bit, correcting the exponent portion and the fraction portion if the incremented fraction portion overflows, and returning the floating point number.