should we break here in the minor cpu execution to terminal the loop earlier when scoreboard.canInstIssure returns false

[gxflying]

Hi sir:
in the Minor CPU execution where we try to issue a instrution by calling scoreboard[thread_id].canInstIssue, we try to find out whether the source register value is ready,
so if the canInstIssue returns false, it means the source register is not ready yet, so maybe there is no need to continue the funcUnit loop while (fu_index != numFuncUnits && !issued) , and add a "break" for this case before L678 to exit useless loop interations.
and acctually the whole issue meight be terminaled here, because this intruction can NOT be issued for source register not being ready anyway!
please help to clarify this, thanks~

                    } else if (!scoreboard[thread_id].canInstIssue(inst,
                        src_latencies, cant_forward_from_fu_indices,
                        cpu.curCycle(), cpu.getContext(thread_id)))
                    {
                        DPRINTF(MinorExecute, "Can't issue inst: %s yet\n",
                            *inst);
                    } else {