Lookahead register value generator and a superscalar microproces

Details Lookahead register value generator and a superscalar microproces Lookahead register value generator and a superscalar microproces

1995-06-07

1998-06-16

Eng, David Y.

G06F 930

Patent

active

057686106

ABSTRACT:
A lookahead register value generator is provided which is configured to maintain lookahead values for registers with respect to instructions decoded in prior clock cycles. Each clock cycle, an instruction having one of these registers and an operand may receive a corresponding operand value generated using the values stored in these lookahead registers while the associated instruction is in the decode stage of the instruction processing pipeline. If the operand value is an address, the value may be used to fetch operand data residing at the address before the instruction arrives in the execute stage of the instruction processing pipeline. Additionally, the lookahead register value generator generates operand values for a second instruction which is dependent upon a concurrently decoded first instruction, thereby removing the dependency therebetween. Instructions for which the values are generated may execute concurrently, as opposed to serially executing.

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