The Basic Principles Of secure displayboards for behavioral units
The Basic Principles Of secure displayboards for behavioral units
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four. The equipment as recited in claim two wherein a redirect as a result of a mispredicted branch instruction is detected at the replay stage, and whereby the Handle circuit, in reaction for the redirect, is configured to repeat the contents of the 2nd scoreboard to the very first scoreboard.
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The issue queue forty gets decoded Recommendations from the decode logic and queues the Guidelines right up until These are graduated. The problem queue comprises a plurality of entries for storing instructions and relevant info. Certain fields of data in an exemplary entry forty eight are revealed in FIG. 2. The sort of instruction is saved in a sort industry with the entry. The type would be the opcode with the instruction (possibly decoded with the decode logic), or could be a subject which implies instruction forms utilized by The problem Handle circuit forty two for choosing Recommendations for situation. One example is, the kind field may possibly reveal not less than the subsequent instruction styles: integer load instruction, integer instruction, floating position load instruction, shorter floating issue instruction, floating issue multiply-incorporate instruction, and lengthy latency floating point instruction.
Considering that the execution latency is larger than one particular clock cycle, other types of dependencies may be scoreboarded. Specifically, a Uncooked dependency may well exist among a primary floating position instruction which updates a location sign-up utilised as a resource sign up by a second floating level instruction. The FP EXE RAW challenge scoreboard 46C could possibly be used to detect these dependencies. The FP EXE RAW replay scoreboard 46D may very well be utilized to Get better the FP EXE Uncooked situation scoreboard 46C in the occasion of the replay/redirect or exception. The little bit comparable to the desired destination sign-up of a floating position instruction can be established within the FP EXE RAW situation scoreboard 46C in response to issuing the instruction. The little bit similar to the destination sign up from the floating issue instruction could possibly be set during the FP EXE RAW replay scoreboard 46D in reaction on the instruction passing the replay phase.
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Turning now to FIG. nine, a flowchart is demonstrated representing operation of one embodiment of circuitry in the issue Manage circuit 42 for detecting replay situations for an integer instruction or integer load/retail store instruction. Other embodiments are possible and contemplated. Though the blocks revealed in FIG. 9 are illustrated in a particular get for simplicity of knowledge, any order may be used.
eight. The equipment as recited in assert seven wherein, In case the third instruction should be to be issued to an integer pipeline of your plurality of pipelines, the Command circuit is configured to permit issuance on the 3rd instruction although the 1st scoreboard get more info signifies a compose pending to one of many operands from the 3rd instruction.
It is observed the floating stage instructions can have a WAW dependency over a preceding floating level load instruction also.
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If your load instruction is often a overlook in the info cache 30 (identified from the Wr phase on the load/shop pipeline, in one embodiment), the update to your spot sign up in the load instruction is pending right up until the miss facts is returned from memory. Retrieving the info from memory may possibly entail extra clock cycles than exist while in the pipeline ahead of the graduation phase (e.g. on the buy of tens or even many clock cycles or maybe more). Accordingly, the load misses are tracked from the integer replay scoreboard 44B and the integer graduation scoreboard 44C. The issue Manage circuit 42 may possibly update the integer replay scoreboard 44B in response to some load overlook passing the replay phase (location the little bit comparable to the desired destination register on the load).
Turning now to FIG. 21, a point out device diagram is shown illustrating a condition equipment Which may be utilized by a single embodiment of the issue Command circuit 42 for managing floating level exceptions.