| 摘要 |
PURPOSE:To shorten the retrieval time by executing a rearrangement of a data, when a retrieving request is outputted to a data belonging to the rear part of a list structure of a data group, and receiving the retrieving request of the next time and thereafter, in a state that the data is in front of the list. CONSTITUTION:A retrieving instruction of a data, and a value used for identifying the data are supplied to a retrieving instruction register 1 and a retrieving data register 2, respectively, and a value of a link operating counter 17 is initialized to zero. Subsequently, a store address of the data which is used as an object of comparison is obtained in an address register 12, and this data is stored in an identifying part register 13, a link part register 14, and a data part register 15, respectively. Next, a value of the counter 17 is increased by '1', values of the register 2 and the register 13 are compared, and whether the data is that which is to be derived or not is decided. If it is not the data to be derived, a pointer is renewed, a store address of the data concerned is stored in a history register 11, a value of the register 12 is updated to a value of the register 14, and the processing is returned to an input of the data.
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