COMPUTER SYSTEM INCLUDING RECONFIGURABLE ARITHMETIC DEVICE AND RECONFIGURABLE ARITHMETIC DEVICE

A computer system includes a central processing unit, a random-access-memory interface, a random-access memory in which addresses are allocated in an address space of the random-access-memory interface and a reconfigurable arithmetic device whose arithmetic function is capable of being dynamically changed in accordance with configuration data. The reconfigurable arithmetic device includes input terminals, output terminals, a plurality of processor elements that perform individual arithmetic processes in synchronization with a clock, an inter-processor-element network which connects the input terminals and the output terminals to input ports and output ports of the plurality of processor elements, a random-access memory built into the reconfigurable arithmetic device and a control unit that sets the plurality of processor elements and the inter-processor-element network.