Entry allocation in a circular buffer using wrap bits indicating

Details Entry allocation in a circular buffer using wrap bits indicating Entry allocation in a circular buffer using wrap bits indicating

1996-04-17

1996-12-10

Coleman, Eric

Boots, shoes, and leggings

364251, 3642444, 364DIG1, 395437, 395250, G06F 1200

Patent

active

055840388

ABSTRACT:
An allocator assigns entries for a circular buffer. The allocator receives requests for storing data in entries of the circular buffer, and generates a head pointer to identify a starting entry in the circular buffer for which circular buffer entries are not allocated. In addition to pointing to an entry in the circular buffer, the head pointer includes a wrap bit. The allocator toggles the wrap bit each time the allocator traverses the linear queue of the circular buffer. A tail pointer is generated, including the wrap bit, to identify an ending entry in the circular buffer for which circular buffer entries are allocated. In response to the request for entries, the allocator sequentially assigns entries for the requests located between the head pointer and the tail pointer. The allocator has application for use in a microprocessor performing out-of-order dispatch anti speculative execution. The allocator is coupled to a reorder buffer, configured as a circular buffer, to permit allocation of entries. The allocator utilizes an all or nothing allocation policy, such that either all or no incoming instructions are allocated during an allocation period.

REFERENCES:
patent: 4616338 (1986-10-01), Helen
patent: 5226126 (1993-07-01), McFarland
patent: 5381528 (1995-01-01), Brunelle
patent: 5450547 (1995-09-01), Nguyen
patent: 5450560 (1995-09-01), Bridges
patent: 5471598 (1995-11-01), Quattromani
patent: 5473756 (1995-12-01), Traylor
A Parallel, High Speed Circular Queue Structure by A. E. Barbour et al., 1990 IEEE, Circuits and Systems.

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