Processor system with efficient shift operations including...

Details Processor system with efficient shift operations including... Processor system with efficient shift operations including...

2002-12-20

2008-08-05

Mai, Tan V (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07409415

ABSTRACT:
An electronic system (2001) for manipulating an input data argument (D[31:0]) comprising an integer number of bits. The system comprises an input (R) for receiving a right direction argument and an input (L) for receiving a left direction argument. The system also comprises circuitry (200) for producing a first data output having the integer number of bits by rotating the input data argument in response to the first direction argument and the second direction argument. The system also comprises circuitry for providing a modified data output (502). The circuitry for providing comprises circuitry for selecting a first set of bits from the first data output as a first portion of the modified data output and circuitry for providing a second set of bits from a source other than the first data output as a second portion of the modified data output.

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D.D. Gajski et al “High-Speed Masking Rotator” Digital Processes, Georgi Publishing Company, vol. 4, 1978, pp. 67-81.
“Fast Masked-Based Bit Extraction and Justification” Research Disclosure, Kenneth Mason Publications, No. 439, No. 1, 2000, p. 2028.

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