Floating point numeric data processor

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364200, G06F 738

Patent

active

047776137

ABSTRACT:
A numeric data processor having an execution unit adapted to efficiently execute the complete set of floating point operations recommended by the IEEE Standard for Binary Floating-Point Arithmetic, ANSI/IEEE Std. 754-1985, in full compliance therewith. The numeric data processor is also adapted to evaluate a large set of transcendental functions, including trigonometric, logarithmic and exponential, consistent with the IEEE Standard, without requiring a "software envelope." In the processor, special hybrid forms of Volder's CORDIC digital approximator and Meggitt's digital approximator are implemented in a manner so as to require minimal additions or modifications to the form of the execution unit which is otherwise required just to execute the standard floating point operations.

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patent: 4484259 (1984-11-01), Palmer et al.
patent: 4509116 (1985-04-01), Lackey et al.
IEEE Standard for Binary Floating-Point Arithmetic, ANSI/IEEE, std 754-1985.
Volder, The CORDIC Trigonometric Computing Technique, IRE Trans. on Electronic Computers, Sep., 1959, pp. 330-334.
Walther, A Unified Algorithm for Elementary Functions, Spring Joint Computer Conference, 1971, pp. 379-385.
Meggitt, Pseudo Division and Pseudo Multiplication Processes, IBM Journal, Apr. 1962, pp. 210-226.

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