Pipelined processor with look-ahead mode of operation

Details Pipelined processor with look-ahead mode of operation Pipelined processor with look-ahead mode of operation

1989-07-03

1991-08-13

MacDonald, Allen R.

Boots, shoes, and leggings

3642287, 3642318, 36494834, 364948, 3649483, 364263, 3642624, G06F 942

Patent

active

050401076

ABSTRACT:
In a pipelined data processor, when a dependency is detected between a first instruction and a second, subsequent instruction, the second instruction is abandoned. A look-ahead mode of operation is then initiated, in which instructions subsequent to the abandoned instruction are allowed to continue to be executed so as to pre-fetch operands, but are not allowed to be fully executed. The processor has two separate streams of instructions, each of which streams can be independently put into look-ahead mode. When one stream is in look-ahead mode, the other is given priority.

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Lee, J. and Smith, A., "Branch Prediction Strategies and Branch Target Buffer Design", IEEE Computer, Jan. 1984, pp. 6-22.

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