Wednesday, September 14, 2011

OOO Execution with In-Order Completion?

Today I was able to find an answer to the following research question:

Can a processor have out-of-order execution and in-order completion?
Yes; with one pipeline per active instruction.  In other words, for every instruction in the active instruction window (every instruction which can be selected for execution) there needs to be a functional unit.  This seems a little impractical and I doubt this sort of processor has been used much.

I am currently working out how the various combinations of in-order/out-of-order and scalar/superscalar affect the design of a processor.  I have the superscalar combinations figured out, and I am currently working on the scalar combinations.

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