Floating-point processor with operand-format precision greater t

Details Floating-point processor with operand-format precision greater t Floating-point processor with operand-format precision greater t

1997-09-19

2000-02-22

Lim, Krisna

Electrical computers and digital processing systems: processing

Processing control

Arithmetic operation instruction processing

708495, 708510, G06F 9302

Patent

active

060292431

ABSTRACT:
A floating-point processor nominally capable of single and double, but not extended, precision execution stores operands in extended-precision format. A format converter converts single and double precision source values to extended-precision format. Trap logic checks the apparent precision of the extended-precision operands and the requested result precision to determine whether the floating-point processor can execute the requested operation and yield the appropriate result. If the maximum of the requested precision and the maximum apparent precision of the operands is single or double, the requested operation is executed in hardware. Otherwise, a trap is issued to call an extended precision floating-point subroutine. This approach augments the class of operations that can be handled in hardware by a double-precision floating-point processor, and thus improves the floating-point computational throughput of an incorporating computer system.

REFERENCES:
patent: 4823260 (1989-04-01), Imel et al.
patent: 5027272 (1991-06-01), Samuels
patent: 5268855 (1993-12-01), Mason et al.
patent: 5481686 (1996-01-01), Dockser
patent: 5523961 (1996-06-01), Naini

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