1. A processing system with reconfigurable instruction extensions, the system comprising: a processor operable to execute a computer program comprising a set of computational instructions and at least one instruction extension; programmable logic operable to receive configuration information to configure the programmable logic for the instruction extension and operable to execute the instruction extension; a register file coupled to the programmable logic and operable to store data; and a load/store module operable to transfer the data directly between the register file and a system memory.