The replay scoreboard may possibly track Directions which have handed the replay stage. So, if replay occurs the replay scoreboard may have the correct state for being restored to The difficulty scoreboards. The graduation scoreboard may perhaps monitor Recommendations that have passed the graduation phase (e.g. cache misses or long latency floating stage operations). If an exception occurs, the graduation scoreboard might include the correct point out to generally be restored for the replay scoreboard and The problem scoreboard.
Turning now to FIG. thirteen, a flowchart is shown representing operation of 1 embodiment of circuitry in the issue Manage circuit 42 for deciding if a floating issue instruction or simply a floating issue load instruction is eligible for difficulty. Other embodiments are doable and contemplated. Even though the blocks proven in FIG. thirteen are illustrated in a selected buy for simplicity of knowledge, any buy may be employed. Furthermore, some blocks may well signify unbiased circuitry operating in parallel with other circuitry. Specially, choice blocks 162, 168, one hundred seventy, and 172 may perhaps Each individual signify circuitry impartial of and running in parallel with the Other folks.
During this way, the two the integer concern scoreboard 44A as well as integer replay scoreboard 44B can be recovered to your condition per the exception. It truly is famous that, by to start with copying the contents with the integer graduation scoreboard 44C on the integer replay scoreboard 44B and afterwards copying the contents on the integer replay scoreboard 44B to the integer problem scoreboard 44A, both scoreboards could be recovered without acquiring two worldwide update paths to the integer issue scoreboard 44A (a person to the integer replay scoreboard 44B and just one for your integer graduation scoreboard 44C). Other embodiments may possibly deliver the two paths and will copy the contents from the integer graduation scoreboard 44C into your integer replay scoreboard 44B and into your integer situation scoreboard 44A in parallel.
For each supply sign up read through (final decision block 90), The problem control circuit 42 might check the integer replay scoreboard 44B to find out In case the source sign up is hectic (conclusion block ninety two). In the event the resource sign up is chaotic while in the integer replay scoreboard 44B, then the instruction should be to be replayed due to a Uncooked dependency on that resource sign-up (block ninety four). The particular assertion of your replay signal secure displayboards for behavioral units could be delayed until eventually the instruction reaches the replay phase, In the event the Examine is completed before the replay stage. Such as, in a single embodiment, the check for resource registers is executed during the register file examine (RR) phase of your integer pipeline and in the AGen phase with the load/retail store pipeline.
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These situations may very well be handled by examining the FP Uncooked relay scoreboard 46A for your spot sign-up of your floating level instruction and replaying the floating stage instruction if a dependency is detected.
Turning now to FIG. 21, a condition device diagram is shown illustrating a condition equipment That could be used by one embodiment of The problem Manage circuit 42 for managing floating stage exceptions.