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four. The apparatus as recited in claim 2 whereby a redirect as a consequence of a mispredicted branch instruction is detected within the replay stage, and wherein the Command circuit, in response towards the redirect, is configured to copy the contents of the next scoreboard to the first scoreboard.

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With this manner, the two the integer challenge scoreboard 44A and also the integer replay scoreboard 44B can be recovered to some point out in line with the exception. It really is famous that, by to start with copying the contents in the integer graduation scoreboard 44C towards the integer replay scoreboard 44B and then copying the contents in the integer replay scoreboard 44B on the integer concern scoreboard 44A, each scoreboards can be recovered devoid of getting two international update paths to the integer challenge scoreboard 44A (one particular for the integer replay scoreboard 44B and just one for the integer graduation scoreboard 44C). Other embodiments may possibly provide the two paths and will copy the contents with the integer graduation scoreboard 44C into the integer replay scoreboard 44B and in the integer concern scoreboard 44A in parallel.

Since the execution latency is larger than just one clock cycle, other sorts of dependencies could possibly be scoreboarded. Particularly, a Uncooked dependency may possibly exist amongst a primary floating point instruction which updates a spot register applied to be a supply sign up by a second floating level instruction. The FP EXE Uncooked issue scoreboard 46C may be utilized to detect these dependencies. The FP EXE RAW replay scoreboard 46D may very well be utilized to Get well the FP EXE RAW issue scoreboard 46C from the function of a replay/redirect or exception. The bit corresponding to the destination sign up of the floating stage instruction may be established while in the FP EXE RAW situation scoreboard 46C in reaction to issuing the instruction. The bit similar to the place sign-up with the floating point instruction may be established inside the FP EXE RAW replay scoreboard 46D in response for the instruction passing the replay phase.

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In different embodiments, extra scoreboards might be used for detecting differing kinds of dependencies (e.g. resource operands which happen to be go through at different details from the pipeline, study after produce dependencies vs.

In response to floating stage fill details becoming presented (conclusion block 130), The problem control circuit 42 clears the bit for the destination sign up of the corresponding floating position load while in the FP Uncooked Load replay and graduation scoreboards 46A-46B (block 132).

The rest of the description will use a little bit Along with the set and clear states as established forth over. On the other hand, other embodiments may possibly reverse the meanings of your set and crystal clear states of your little bit or may perhaps use multibit indications.

28. The strategy as recited in claim 27 whereby the 1st scoreboard and the next scoreboard track pending writes to floating position registers, the method additional comprising figuring out whether or not a floating point multiply-add instruction is issuable by checking the multiplicand operands towards the primary scoreboard as well as the add operand in opposition to the 3rd scoreboard.

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In addition, The problem Management circuit forty two may reduce subsequent concern of instructions until finally it is understood that the issued floating stage Directions will report exceptions, if any, just before any subsequently issued instructions committing an get more info update (e.g. passing the graduation phase). In a single embodiment, the FP Madd Uncooked issue scoreboard 46E could be used for this function. Considering that the FP Madd RAW situation scoreboard 46E bits are cleared nine clock cycles ahead of the corresponding floating stage instruction reaches the sign up file compose (Wr) stage (and reviews an exception), a subsequent instruction may very well be issued eight clock cycles before the corresponding floating point instruction reaches the register file publish (Wr) stage. For floating stage instructions, to ensure the Wr/graduation phase is once the corresponding floating level instruction's Wr stage, the results of the OR may very well be delayed by 1 clock cycle after which you can employed to allow issue of your floating point Guidelines to happen (e.

The vacation spot register range might include things like a little bit distinguishing floating point registers from integer registers, or possibly a independent signal may very well be equipped indicating if the sign up number is really an integer or floating point register (as well as a independent sign of the sort of register can be stored while in the location register field 216 or one other discipline 220).

It is actually noted that, whilst FIG. one illustrates two integer execution units, two floating level execution units, and two load/shop units, other embodiments may perhaps make use of any variety of Each and every type of device, and the quantity of a single type may possibly differ from the quantity of Yet another style.

Because the sign-up file examine in the integer pipeline is skewed to align with the data forwarding through the load/keep pipeline, dependencies on the load spot sign up needn't inhibit issue. If a load skip dependency exists, it may be detected while in the replay stage and cause the instruction to become replayed.