| 摘要 |
PROBLEM TO BE SOLVED: To prevent an occurrence of a branch penalty in a microcomputer.SOLUTION: The microcomputer includes a branch detection circuit for detecting a branch instruction from an instruction outputted from an instruction memory to an instruction queue, a branch destination determination circuit for determining whether a corresponding branch instruction is stored in the instruction queue when the branch instruction is detected, and a queue control circuit. A copy object includes the range from a branch destination instruction corresponding to the detected branch instruction till the preceding instruction of the detected branch instruction. The queue control circuit stores an instruction of the copy object in the instruction queue again each time the instruction is executed. In the case that a branch condition about the branch instruction is established, the queue control circuit moves the copy object stored in the instruction queue to the head of the instruction queue. |
