Method and apparatus for selecting a rounding mode for a numeric

Details Method and apparatus for selecting a rounding mode for a numeric Method and apparatus for selecting a rounding mode for a numeric

1996-12-02

2000-05-02

Maung, Zarni

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

708550, G06F 738

Patent

active

060584106

ABSTRACT:
A processor contains a storage area for a dynamic rounding mode control value, and a circuit coupled to the storage area configured to execute an instruction using a rounding mode. When the instruction is a first predetermined instruction, a first predetermined rounding mode is used during execution of the instruction. When the instruction is not the first predetermined instruction and the rounding mode specified by the instruction is not a dynamic override, the circuit executes the instruction using a rounding mode specified by the instruction. When the instruction is not the first predetermined instruction and the rounding mode specified by the instruction is the dynamic override, the circuit executes the instruction using a rounding mode specified by the dynamic rounding mode control value.

REFERENCES:
patent: 5404324 (1995-04-01), Colon-Bonet
patent: 5548544 (1996-08-01), Matheny et al.
patent: 5568412 (1996-10-01), Han et al.
patent: 5612909 (1997-03-01), Morrow
patent: 5696709 (1997-12-01), Smith et al.

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