| 摘要 |
When a barrel shift device is divided into pipeline registers and shifting is executed at a multistage processing stage, a second control signal for controlling the shift amount of a second shift circuit (50) is decoded by a decode circuit (20), and thereby at which digit place of intermediate data in an intermediate data holding circuit(30) the data element finally outputted as output data from the second shift circuit(50) is present is detected. The intermediate data holding circuit(30) holds only the finally outputted data element out of the data elements in intermediate data depending on the result of detection of the digit place of the decode circuit(20), and does not hold unnecessary data elements which the output data does not reflect. Therefore, data storage operation of the intermediate data holding circuit (30) is controlled, and an increase of electric power due to the conversion into the pipeline structure is suppressed.
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