PROCESSOR

摘要

A processor having a forwarding function and comprises an attribute information holding section (141) for holding attribute information on write inhibition of a register and a register write inhibition circuit (126) for inhibiting forwarded data write in a register according to the attribute information when forwarding has occurred. The attribute information holding section (141) holds the attribute information made to correspond to at least one register. Alternatively, the attribute information holding section is a part of pipeline buffer and delivers the attribute information to the succeeding-stage pipeline buffer along with the data to be forwarded.