| 摘要 |
PURPOSE:To increase the processing speed of an arithmetic processor by giving an access to a stack memory of a main memory only in case the arithmetic processing is impossible within a stack memory of the arithmetic processor. CONSTITUTION:When a bush instruction is read out, a control circuit 22 gives -1 to a top stack pointer SPT 22 and delivers the information from a memory data register 9 to write it to an address indicated by the pointer SPT 22 of a stack buffer 20. Then -1 is given to a bottom stack pointer SPB 21 together with -1 given to a stack pointer register 4 after the information is written to the buffer 20 and a full state is obtained with SPT=SPB. Then the contents of the buffer 20 shown by the SPB 21 are read out to an internal bus 10. Then the buffer 20 is made idle by an amount equivalent to a piece of information for the next instruction. The information read out to an internal bus 10 is stored in an address of a stack memory 15 shown by a stack pointer register 4 via a memory register 9.
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