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The load instruction information is forwarded from the Cache stage inside the existing embodiment, so the issue Management circuit forty two may crystal clear the scoreboard bit similar to the destination sign-up on the integer load instruction in the event the integer load instruction reaches the TLB stage.
Evaluating operands of instructions versus a replay scoreboard to detect an instruction replay and copying a replay scoreboard to a concern scoreboard Down load PDF Info
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Various scoreboards can be applied to track instructions and to offer for correction in the scoreboards from the event of replay/redirect (which come about in the identical pipeline phase With this embodiment, called the “replay stage” herein, While other embodiments may possibly sign replay and redirect at unique pipeline phases) or exception (signaled in a graduation stage of the pipeline wherein the instruction turns into devoted to updating architected condition with the processor ten). The problem scoreboard may be used by The difficulty Command logic to select Directions for difficulty. The problem scoreboard might be speculatively up to date to trace Recommendations early while in the pipeline (with assumptions made that cache hits take place on hundreds and that branch predictions are suitable).
It's mentioned that other embodiments may perhaps hire much less scoreboards. For instance, the FP EXE WAW scoreboards 46G and 46H could possibly be eradicated along with the FP Load WAW scoreboards 46I and 46J can be checked rather for detecting WAW dependencies for floating stage Recommendations (and less overlap between floating level Recommendations along with the floating point load Guidance which rely upon All those floating place Recommendations).
15. The equipment as recited in assert 13 wherein the Management circuit is configured to check for a read just after compose dependency for an instruction for being issued using the very first scoreboard and to look for a publish after produce dependency using the 3rd scoreboard.
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A write-soon after-create (WAW) dependency exists amongst the very first instruction and the next instruction exists if equally the main and next instructions write the identical register.
It is observed the copying of the contents of one scoreboard to a different might be delayed by one or more clock cycles within the detection of the corresponding event (e.g. the detection of replay/redirect or exception).
The desired destination sign-up range may perhaps include things like a bit distinguishing floating point registers from integer registers, or perhaps a independent sign may very well be equipped indicating whether the sign up amount can be an integer or floating place register (along with a separate sign of the type of register can be stored in the destination sign up discipline 216 or one other area 220).
The bit could possibly be cleared in both equally scoreboards 5 clock cycles before the floating stage instruction updates its result. The number of clock cycles may possibly range in other embodiments. Usually, the quantity of clock cycles is selected to align the register file read (RR) phase from the dependent instruction While using the stage at which outcome data is forwarded to the prior floating level instruction. The quantity may rely upon the amount of pipeline levels among The difficulty phase as well as the sign up file examine (RR) stage with the floating issue pipeline (which includes both of those levels) and the quantity of phases amongst The end result forwarding stage and also the here write stage with the floating issue pipeline.
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