Data cache configured to store data in a use-once manner

Details Data cache configured to store data in a use-once manner Data cache configured to store data in a use-once manner

1996-05-06

1998-10-27

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711137, 711120, G06F 1208

Patent

active

058290281

ABSTRACT:
A cache is provided which prefetches data words associated with a particular addressing mode. When a data word is accessed in response to the execution of an instruction, the data word is discarded by the cache. Data which is accessed in a use-once fashion (such as DSP data, for example) may be thereby available with cache-hit memory access times instead of main memory access times. The present cache prefetches data words spaced at regular or irregular intervals, wherein the interval is specified by the addressing mode of the instruction. Multiple words within a data stream may be successfully prefetched. The cache described herein may be incorporated into a microprocessor having a conventional cache as well. Data which is indicated to be used once may be stored in the present cache, while data exhibiting locality may be stored in the conventional cache. Data which exhibits locality is thereby retained within the cache system when use-once data is accessed.

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Palacharla et al., "Evaluating Stream Buffers as a Secondary Cache Replacement", IEEE, 1063-6897/94, p. 26, 1994.
Zucker et al., "A Comparison of Hardware Prefetching Techniques For Multimedia Benchmarks", IEEE, 0-8186-7436-9/96, 241-243, Sep. 1996.
Chan et al., "Pyramid-Structured Multiprocessor System for Image Processing", IEEE, 87CH2518-9, pp. 149-152, 1987.

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