Details, Fiction and secure displayboards for behavioral units
Details, Fiction and secure displayboards for behavioral units
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FIG. 13 may possibly stand for the circuitry for looking at 1 instruction in one situation queue entry for situation. Related circuitry may very well be provided for every difficulty queue entry, or for several issue queue entries at the head of the queue (e.g. for in order embodiments, the volume of situation queue entries from which Guidance may be issued may be less than the overall quantity of difficulty queue entries). FIG. 13 illustrates detecting if a floating position instruction is qualified for situation based upon dependencies indicated by the scoreboards. Other situation constraints (e.g. prior Directions in program purchase issuable to the same pipeline, and so forth.) may differ from embodiment to embodiment and may have an impact on whether or not the instruction is really issued.
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one. An apparatus comprising: a primary scoreboard functioning as an issue scoreboard to scoreboard Guidelines for concern; a next scoreboard operating to be a replay scoreboard to scoreboard Guidance which have handed a replay phase inside a pipeline; in addition to a Manage circuit coupled to the main scoreboard and the 2nd scoreboard, whereby the Management circuit is configured to update the first scoreboard to indicate that a create is pending for a first vacation spot sign up of a first instruction in reaction to issuing the primary instruction into your pipeline, and whereby the Command circuit is configured to update the next scoreboard to indicate that the create is pending for the initial destination sign-up in response to the very first instruction passing the replay phase on the pipeline, wherein the Handle circuit, in response to a replay of the next instruction by examining operands of the 2nd instruction versus the next scoreboard, is configured to repeat contents of the next scoreboard to the initial scoreboard.
In case the instruction isn't remaining selected for the load/keep pipeline (i.e. the instruction is currently being picked for that integer pipeline), then the resource registers with the instruction are certainly not checked against the integer situation scoreboard 44A (decision block eighty, “no” leg) plus the instruction can be qualified for situation (assuming other problem constraints are satisfied—block 84).
With this fashion, updates for the integer problem scoreboard 44A and also to the integer replay scoreboard 44B in reaction to Recommendations which might be canceled because of the exception could be deleted in the integer difficulty and replay scoreboards 44A-44B plus the condition in the scoreboard for Guidelines which were not canceled (load misses which have progressed beyond the graduation phase) are retained. In one embodiment, the integer graduation scoreboard 44C is copied into the integer replay scoreboard 44B, which is subsequently copied into the integer difficulty scoreboard 44A.
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The operation of FIG. eight may possibly characterize the circuitry for considering 1 instruction in a single situation queue entry for problem. Comparable circuitry may very well be provided for every problem queue entry, or for numerous concern queue entries at the head with the queue (e.g. for in order embodiments, the quantity of concern queue entries from which Guidance can be issued could be fewer than the full quantity of challenge queue entries).
g. Guidelines might be issued in a unique buy than This system order). In other embodiments, so as execution may be applied. On the other hand, some speculative issue/execution should still occur concerning time that a branch instruction is issued and its result is produced from the execution unit which executes that department instruction (e.g. the execution unit may have more than one pipeline phase).
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Replay may be signaled for a offered instruction at the initial stage. In reaction to some replay of a next instruction, the Regulate circuit is configured to copy a contents of the 2nd scoreboard to the main scoreboard. In many embodiments, supplemental scoreboards may very well be utilized for check here detecting different types of dependencies.
If a replay is detected by The difficulty Regulate circuit forty two or if a redirect is signaled with the integer execution unit 22A (conclusion block 70), The difficulty Regulate circuit 42 copies the contents from the integer replay scoreboard 44B towards the integer situation scoreboard 44A (block 72). If an exception is detected by an execution device 22A-22B, 24A-24B, or 26A-26B (final decision block 74), The difficulty Regulate circuit forty two copies the contents of the integer graduation scoreboard 44C to the integer replay scoreboard 44B (block seventy six) and may subsequently duplicate the contents from the integer replay scoreboard 44B (now equivalent for the contents of the integer graduation scoreboard 44C) into the integer situation scoreboard 44A (block seventy eight).