| 摘要 |
PURPOSE:To effectively use a memory by detecting a loop which is previously registered on a real time basis when it exists in the middle of trace and preventing the execution part of the loop from being stored overlapping in the trace memory. CONSTITUTION:When a real execution address reaches a loop leading address which is previously registered in a loop address register 5, it is detected whether it reaches the address for the first time as the result of the sequential execution of the program or as the result of branching to the head of the loop by a branching command for executing the loop. When it branches to the head of the loop, the execution result is not written into the new address of the trace memory 1 but it is overwritten in the address where data obtained when the loop is sequentially executed for the first time is stored. Thus, the substantial decrease of effective trace data owing to the execution of the loop is prevented and the trace memory is used at a maximum. |
