Electrical computers and digital processing systems: processing – Byte-word rearranging – bit-field insertion or extraction,...
Reexamination Certificate
2003-07-23
2008-09-09
Dollinger, Tonia L. M. (Department: 2181)
Electrical computers and digital processing systems: processing
Byte-word rearranging, bit-field insertion or extraction,...
C712S202000, C712S220000
Reexamination Certificate
active
07424600
ABSTRACT:
The information processing apparatus includes: a process unit having one or more registers that retain data used for calculation; a compression unit that compresses and saves the content in the register to a stack memory; and a decompression unit that decompresses and restores the data saved in the stack memory, to the corresponding registers. If a first decoding unit included in the process unit has decoded a call instruction which is assigned a compression control bit, the compression unit, in executing the call instruction, performs compression before saving the content of the registers to the stack memory. If a second decoding unit included in the process unit has decoded a return instruction which is assigned a decompression control bit, the decompression unit, in executing the return instruction, performs decompression before restoring the content saved in the stack memory to the registers.
REFERENCES:
patent: 3987412 (1976-10-01), Morrin, II
patent: 5241679 (1993-08-01), Nakagawa et al.
Dollinger Tonia L. M.
Matsushita Electric - Industrial Co., Ltd.
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