Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2006-03-14
2006-03-14
Nguyen, Hiep T. (Department: 2187)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C712S228000
Reexamination Certificate
active
07013377
ABSTRACT:
A method and apparatus provides the capability for a single function to safely use multiple register windows within the same function, with minimal additional support from the operating system, by specifying a new window pointer, the “Effective Current Window Pointer” (ECWP), to be used in conjunction with the prior art window pointer. According to the present invention, the new window pointer ECWP can be used to override the prior art window pointer in dictating from which register window the operands stipulated by the instructions to be executed are sourced/sinked. Consequently, using the method and apparatus of the invention, the number of spills to memory is reduced, the number of instructions required is decreased, resources are used more efficiently, and costly dependency problems and RAW (read-after-write) stalls are prevented.
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Hart Steven R.
Spracklen Lawrence A.
Vlaovic Stevan
Gunnison McKay & Hodgson, L.L.P.
McKay Philip J.
Nguyen Hiep T.
Sun Microsystems Inc.
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