Processor

Details Processor Processor

1997-10-09

1999-11-23

Maung, Zarni

Electrical computers and digital processing systems: processing

Processing control

Branching

712237, 712235, 712236, 712234, G06F 1300

Patent

active

059918721

ABSTRACT:
Microprocessors use a conditional branch instruction so as to change processing in accordance with conditions. According to the prior art, a NOP instruction, which causes no operation, is used when a condition is satisfied, and the use of the NOP instruction inevitably lengthens the processing time. According to the present invention, a conditional transfer instruction is included in the instruction set of a microprocessor, and a flag decoder is additionally employed. The flag decoder determines whether a condition is satisfied or not, and outputs a control signal on the basis of the determination. The control signal is supplied to the instruction decoder of the processor to make a data transfer operation effective or ineffective. Accordingly, it is not necessary to use a NOP instruction, and the processing time can be as short as possible.

REFERENCES:
patent: 4310881 (1982-01-01), Eldumiati
patent: 5077663 (1991-12-01), Kanazawa
patent: 5185869 (1993-02-01), Suzuki
patent: 5201057 (1993-04-01), Uht
patent: 5469551 (1995-11-01), Sites et al.
patent: 5537560 (1996-07-01), Boggs et al.

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