Method and apparatus for compressing the execution time of an in

Details Method and apparatus for compressing the execution time of an in Method and apparatus for compressing the execution time of an in

1988-06-30

1991-07-09

Chan, Eddie P.

Boots, shoes, and leggings

3642318, 364264, 3642646, 3642594, 3642599, G06F 938, G06F 930

Patent

active

050310968

ABSTRACT:
Apparatus and method which provides a variable instruction stack. Instructions to be executed are fed into a single input multiple output stack register feeding from the lowest to the highest level. Instructions are provided with a valid bit to distinguish instructions requiring execution from those requiring no execution (NOOP). When an instruction not requiring execution (NOOP) propagates to the highest level, the execution unit receives an instruction in a lower level of the stack avoiding any idle time of the execution unit waiting for an executable instruction to propagate to the highest level.

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IBM Tech Discl. Bulletin; vol. 27, No. 2, Jul. 1984 "Prioritized Instruction Executions" by L. Lin p. 1087.
IBM Tech. Discl. Bull. vol. 15, No. 5; Oct. 1972 "Queue System For 4 Two-Program; Pipelined Instruction Unit"; Fennell, Jr.; pp. 1523-1525.
IBM Journal, Jan. 1967 "An Efficient Algorithm for Exploiting Multiple Arithmetic Units"; R. M. Tomasulo.

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