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Definition of "circular register buffer" |
a set of general purpose CPU registers organized to provide a large number of registers, which may be accessed a few at a time. The group of registers accessible at any particular time may be readily changed by incrementing or decrementing a pointer, with wraparound occurring from the highest numbered registers to the lowest numbered registers, hence the name circular register buffer. There is overlap between the groups of adjoining registers that are accessible when switching occurs. The overlapping registers can be used for passing arguments during subroutine calls and returns. The circular register buffer is a feature of the SPARC CPU architecture. In the SPARC CPU there are 256 registers, available 32 at a time, with an overlap of eight registers above and eight registers below the current group. |
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