Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1996-12-16
1999-02-09
Ellis, Richard L.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
395384, 395386, 395391, 395392, 395383, 39580024, 701125, 701207, 701118, G06F 1204, G06F 1300, G06F 930
Patent
active
058705767
ABSTRACT:
Methods apparatus for storing and expanding wide instruction words in a computer system are provided. The computer system includes a memory and an instruction cache. Compressed instruction words of a program are stored in a code heap segment of the memory, and code pointers are stored in a code pointer segment of the memory. Each of the code pointers contains a pointer to one of the compressed instruction words. Part of the program is stored in the instruction cache as expanded instruction words. During execution of the program, an instruction word is accessed in the instruction cache. When the instruction word required for execution is not present in the instruction cache, thereby indicating a cache miss, a code pointer corresponding to the required instruction word is accessed in the code pointer segment of memory. The code pointer is used to access a compressed instruction word corresponding to the required instruction word in the code heap segment of memory. The compressed instruction word is expanded to provide an expanded instruction word, which is loaded into the instruction cache and is accessed for execution.
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Faraboschi Paolo
Fisher Joseph A.
Ellis Richard L.
Hewlett--Packard Company
Thomson William D.
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