For the extensive latency floating place instructions, The difficulty Manage circuit forty two might trust in receiving the op cmpl indicator for your instruction. The floating stage execution units 24A-24B may well deliver these indications for long latency floating position Guidelines in time to permit The problem Command circuit 42 to determine the intervals. So, the sign could possibly be at least the volume of clock cycles before the sign-up file generate as the earliest of your situations checked for (e.g. 9 clock cycles right before, In this particular embodiment).
However, integer Directions might be issued to your integer pipelines (since the integer problem scoreboard will not be checked for issuing Guidance to the integer pipelines) and floating stage Directions could possibly be issued to the floating position pipelines (Considering that the load pass up is tracked in replay and graduation scoreboards although not a difficulty scoreboard). If these Guidelines are dependent on the load pass up, then They might be replayed regularly right until the fill info is returned. Electricity is wasted in these circumstances via the repeated tries to execute the dependent Guidance.
The problem queue 40 receives decoded Guidelines from your decode logic and queues the Directions until finally They're graduated. The issue queue comprises a plurality of entries for storing instructions and linked info. Sure fields of information within an exemplary entry forty eight are demonstrated in FIG. two. The type of instruction is stored in a type field from the entry. The sort may be the opcode of your instruction (maybe decoded through the decode logic), or may be a field which implies instruction types employed by the issue Regulate circuit 42 for choosing instructions for issue. As an example, the type industry may suggest at the very least the following instruction types: integer load instruction, integer instruction, floating point load instruction, short floating issue instruction, floating place multiply-add instruction, and long latency floating level instruction.
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All through the choice of Recommendations for problem, the issue Regulate circuit forty two may perhaps Test the integer challenge scoreboard 44A. Particularly, the integer situation scoreboard 44A may possibly selectively be used in the choice of Recommendations for concern based upon which pipeline the integer instruction will be to be issued to. In the event the integer instruction is always to be issued on the load/store pipeline, The difficulty control circuit 42 may perhaps Test the integer situation scoreboard 44A and inhibit problem if a resource sign up is chaotic from the scoreboard. If your integer instruction will be to be issued for the integer pipeline, The difficulty Command circuit 42 might not use the contents in the integer situation scoreboard 44A in the issue assortment method (Because the integer pipeline will not examine registers until finally the load facts would be to be forwarded to your integer pipelines).
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Turning now to FIG. nine, a flowchart is shown symbolizing Procedure of one embodiment of circuitry in the issue Regulate circuit 42 for detecting replay situations for an integer instruction or integer load/keep instruction. Other embodiments are feasible and contemplated. When the blocks demonstrated in FIG. 9 are illustrated in a certain order for relieve of knowledge, any get might be employed.
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Accordingly, in such embodiments, the issue Regulate circuit 42 might not set bits during the FP EXE WAW situation and replay scoreboards 46G-46H or maybe the FP Madd Uncooked issue and replay scoreboards 46E-46F in blocks one hundred twenty and 124 for short floating level Guidelines.
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In this kind of an embodiment, the tag can be inherent within the entry and so may not be explicitly saved within the entry. The tag may be a tag assigned into the load instruction by The difficulty Manage circuit 42 (e.g. a tag identifying the issue queue entry storing the load instruction or possibly a tag indicating the sequence of your load instruction in the exceptional Guidelines in the pipeline).
FIGS. six-9 are flowcharts illustrating the operation of one embodiment of The difficulty Handle circuit 42 to the integer scoreboards and integer instruction difficulty. Usually, the circuitry represented by FIGS. six-nine may well pick which pipe phase an instruction is in by inspecting the pipe condition during the corresponding entry of The difficulty queue forty. Seen in another way, the circuitry represented by a given conclusion block might decode the sort subject in Each individual entry along with the corresponding pipe state to detect if an instruction in almost more info any difficulty queue entry is definitely an instruction while in the pipe stage looked for by That call block.
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