4. The apparatus as recited in declare 2 wherein a redirect due to a mispredicted branch instruction is detected on the replay phase, and whereby the Manage circuit, in response towards the redirect, is configured to copy the contents of the second scoreboard to the primary scoreboard.
Although the invention is liable to various modifications and different types, distinct embodiments thereof are revealed Through instance inside the drawings and can herein be described in detail. It ought to be understood, even so, which the drawings and specific description thereto are usually not intended to Restrict the creation to the particular variety disclosed, but on the contrary, the intention would be to cover all modifications, equivalents and alternatives falling within the spirit and scope from the current creation as outlined by the appended statements.
Execution with the instruction begins in clock cycle four and carries on for N clock cycles. The number of clock cycles (N) might fluctuate based on which on the extended latency floating level Directions is executed, and could, sometimes, be dependent on the operand info for your instruction.
It is famous that, in A different embodiment, stalling of instruction concern after the issuance of a floating level instruction may only be performed inside the floating place instruction just isn't a short floating point instruction. Brief floating stage Recommendations, in one embodiment, get to the create stage in clock cycle eight in FIG.
During the choice of Directions for concern, The problem Regulate circuit 42 may Look at the integer challenge scoreboard 44A. Specially, the integer concern scoreboard 44A might selectively be used in the choice of instructions for difficulty depending on which pipeline the integer instruction is to be issued to. If the integer instruction should be to be issued towards the load/retail outlet pipeline, The problem Command circuit forty two might Check out the integer difficulty scoreboard 44A and inhibit situation if a supply register is fast paced during the scoreboard. In case the integer instruction is to be issued to your integer pipeline, The difficulty Regulate circuit forty two may not make 9roenc LLC use of the contents of your integer concern scoreboard 44A in The problem collection approach (since the integer pipeline won't study registers right up until the load facts should be to be forwarded for the integer pipelines).
nine. The apparatus as recited in assert eight wherein the integer pipeline features a sign-up read phase which can be delayed to align the sign up browse stage using a knowledge forwarding phase on the load/store pipeline.
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The Procedure of FIG. eight may possibly stand for the circuitry for looking at just one instruction in a single problem queue entry for problem. Comparable circuitry might be supplied for every difficulty queue entry, or for a variety of situation queue entries at The pinnacle with the queue (e.g. for in order embodiments, the volume of concern queue entries from which Recommendations may very well be issued can be lower than the overall range of problem queue entries).
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It is observed that the copying in the contents of one scoreboard to a different may be delayed by one or more clock cycles from your detection of the corresponding function (e.g. the detection of replay/redirect or exception).
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If at the very least one of the source registers is active, the instruction isn't picked for situation. In case the resource registers are usually not hectic, the instruction is qualified for challenge (assuming any other problem constraints not relevant to dependencies are achieved—block 84). Other situation constraints (e.g. prior Guidance in application get issuable to exactly the same pipeline) may well vary from embodiment to embodiment and will have an impact on whether the instruction is in fact issued.
It's famous that Guidance have already been explained herein as concurrently issued or co-issued. These terms are meant to be synonymous.