10. The equipment as recited in declare 5 whereby the main instruction is often a load instruction, and wherein the load instruction passes the replay phase When the load instruction misses in a knowledge cache.
The tag industry 218 suppliers a tag which identifies the fill akin to the cache pass up represented in that entry. The tag can be any sort of tag. In one embodiment, the tag may be a transaction identifier assigned towards the browse transaction initiated via the bus interface device 32 if the read through transaction is initiated. The tag may also certainly be a tag assigned to your examine queue entry or figuring out the study queue entry.
FIG. 21 is a state equipment diagram illustrating a person embodiment of challenge Procedure inside a pipeline during which floating issue Recommendations graduate later on than integer functions.
An instruction is “replayed” if its recent execution is canceled (i.e. it doesn't update architected condition of the processor 10) and it really is later re-issued from the issue queue. To put it differently, the instruction is retained in the issue queue for doable replay following it truly is issued. In a single embodiment, execution of Guidelines is if you want and the replay also causes the cancellation of subsequent Guidelines (such as the deletion of corresponding scoreboard indications), but prior instructions (and their scoreboard indications) are retained. Other embodiments may be made for out of order, where situation the cancellation/deletion from the scoreboard for the next Recommendations could be selective based on whether the following instruction has a dependency over a replayed instruction. Furthermore, an instruction may perhaps encounter an exception (e.g. architected exceptions), which brings about subsequent instructions being canceled but yet again prior instructions will not be canceled.
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In this particular method, updates into the integer problem scoreboard 44A and to the integer replay scoreboard 44B in response to instructions which can be canceled mainly because of the exception might be deleted within the integer difficulty and replay scoreboards 44A-44B and also the point out in the scoreboard for Guidelines which weren't canceled (load misses that have progressed beyond the graduation phase) are retained. In a single embodiment, the integer graduation scoreboard 44C is copied to the integer replay scoreboard 44B, which is subsequently copied on the integer challenge scoreboard 44A.
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In one implementation, the processor 10 is intended to the MIPS instruction established architecture (such as the MIPS-3D and MIPS MDMX application certain extensions). The MIPS instruction set can be applied underneath as a particular example of sure Recommendations.
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FIGS. six-nine are flowcharts illustrating the Procedure of 1 embodiment of The difficulty Handle circuit 42 for the integer scoreboards and integer instruction situation. Generally, the circuitry represented by FIGS. six-nine could select which pipe stage an instruction is in by examining the pipe state inside the corresponding entry of The problem queue 40. Considered in yet another way, the circuitry represented by a offered determination block may well decode the kind subject in Each individual entry and the corresponding pipe point out to detect if an instruction in any issue queue entry is surely an instruction within the pipe phase searched for by that decision block.
It really is famous that instructions happen to be described herein as concurrently issued or co-issued. These conditions are meant to be synonymous.