Method and apparatus for predicting address of a subsequent cach

Details Method and apparatus for predicting address of a subsequent cach Method and apparatus for predicting address of a subsequent cach

1989-06-12

1992-03-03

Lee, Thomas C.

Boots, shoes, and leggings

3642434, 3642443, 364246, 3642631, 364264, 3642653, 364253, 3642531, 3642242, 3642759, 364DIG1, G06F 1206, G06F 1208

Patent

active

050937774

ABSTRACT:
In a data processing system which employs a cache memory feature, a method and exemplary special purpose apparatus for practicing the method are disclosed to lower the cache miss ratio for called operands. Recent cache misses are stored in a first in, first out miss stack, and the stored addresses are searched for displacement patterns thereamong. Any detected pattern is then employed to predict a succeeding cache miss by prefetching from main memory the signal identified by the predictive address. The apparatus for performing this task is preferably hard wired for speed purposes and includes subtraction circuits for evaluating variously displaced addresses in the miss stack and comparator circuits for determining if the outputs from at least two subtraction circuits are the same indicating a pattern yielding information which can be combined with an address in the stack to develop a predictive address.

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